diff --git a/readme.md b/readme.md
index 8e85647..c8ab4a9 100644
--- a/readme.md
+++ b/readme.md
@@ -213,13 +213,15 @@ Handle project workflows in a unified way:
 
 ### Shell
 
-* banner with constants for characters
+* banner
+  * constants for characters
+  * dynamic substeps
 * comment
 * review repositories handling for systems
   * opensuse
     * codecs repository
     * disable & enable https
-* write unit tests
+* test
 
 ### Shell → Python
 
@@ -247,6 +249,7 @@ Handle project workflows in a unified way:
   * .py
   * .sh
     * maximum line length
+* comment
 * detect ssh private key type
 * fit banner to text
 * implement substeps
@@ -255,7 +258,7 @@ Handle project workflows in a unified way:
   * actions
   * includes
 * try git repo url variable first for shunit
-* write unit tests
+* test
 
 ### Later
 
diff --git a/spcd/main.sh b/spcd/main.sh
index 5b1b34c..0835f1e 100644
--- a/spcd/main.sh
+++ b/spcd/main.sh
@@ -866,6 +866,30 @@ ${SPCD_PYTHON_ALIAS} / ${spcd_stp__name}"
     "${SPCD_PYTHON_ALIAS}" -m "${spcd_stp__name}"
 }
 
+# ╭───────────┬──────╮
+# │ functions │ step │
+# ╰───────────┴──────╯
+
+spcd_step() {
+    if [ -n "${1}" ]; then
+        spcd_step__prefix="SPCD_STEP_${SPCD_STEP_LEVEL}"
+        spcd_step__index="${spcd_step__prefix}_INDEX"
+        eval "${spcd_step__index}=\$((${spcd_step__index} + 1))"
+        eval "${spcd_step__prefix}_LABEL=\"${1}\""
+        spcd_banner_render
+    fi
+}
+
+spcd_step_in() {
+    SPCD_STEP_LEVEL=$((SPCD_STEP_LEVEL + 1))
+    spcd_step_wipe
+}
+
+spcd_step_out() {
+    spcd_step_wipe
+    SPCD_STEP_LEVEL=$((SPCD_STEP_LEVEL - 1))
+}
+
 # ╭───────────╮
 # │ functions │
 # ╰───────────╯
@@ -1016,19 +1040,6 @@ spcd_split() {
     echo "${SPCD_SPLT}"
 }
 
-spcd_step() {
-    SPCD_STEP=$((SPCD_STEP + 1))
-    SPCD_STEP_TEXT="${*}"
-    unset SPCD_SUBSTEP SPCD_SUBSTEP_TEXT
-    spcd_banner
-}
-
-spcd_substep() {
-    SPCD_SUBSTEP=$((SPCD_SUBSTEP + 1))
-    SPCD_SUBSTEP_TEXT="${*}"
-    spcd_banner
-}
-
 spcd_write() {
     spcd_write__file="${1}"
     spcd_write__text="${2}"
@@ -1097,74 +1108,123 @@ spcd_fill() {
 # │ internal │ banner │
 # ╰──────────┴────────╯
 
-spcd_banner() {
-    spcd_banner_unset
-    spcd_banner_open
-    #
-    spcd_banner__index="${SPCD_STEP}"
-    [ -n "${SPCD_SUBSTEP}" ] &&
-        spcd_banner__index="${spcd_banner__index}.${SPCD_SUBSTEP}"
-    spcd_banner_add "${spcd_banner__index}"
-    #
-    spcd_banner_split
-    spcd_banner_add "S"
-    #
-    for spcd_banner__item in "${SPCD_STEP_TEXT}" "${SPCD_SUBSTEP_TEXT}"; do
-        if [ -n "${spcd_banner__item}" ]; then
-            spcd_banner_split
-            spcd_banner_add "${spcd_banner__item}"
-        fi
-    done
-    #
-    spcd_banner_close
-    #
-    spcd_banner_echo
-    spcd_banner_unset
-}
+SPCD_BANNER_DOWN_AND_HORIZONTAL="┬"
+SPCD_BANNER_DOWN_AND_LEFT="╮"
+SPCD_BANNER_DOWN_AND_RIGHT="╭"
+SPCD_BANNER_HORIZONTAL="─"
+SPCD_BANNER_UP_AND_HORIZONTAL="┴"
+SPCD_BANNER_UP_AND_LEFT="╯"
+SPCD_BANNER_UP_AND_RIGHT="╰"
+SPCD_BANNER_VERTICAL="│"
 
 spcd_banner_add() {
     if [ -n "${1}" ]; then
         spcd_ba__text=" ${1} "
         spcd_ba__length=${#spcd_ba__text}
-        spcd_ba__filler="$(spcd_fill "${spcd_ba__length}" ─)"
+        spcd_ba__filler="$(
+            spcd_fill "${spcd_ba__length}" "${SPCD_BANNER_HORIZONTAL}"
+        )"
+        if [ -n "${SPCD_BANNER_MIDDLE}" ]; then
+            spcd_banner_split
+        else
+            spcd_banner_open
+        fi
         spcd_banner_append \
             "${spcd_ba__filler}" "${spcd_ba__text}" "${spcd_ba__filler}"
     fi
 }
 
+spcd_banner_add_index() {
+    unset spcd_bi__label
+    unset spcd_bi__level
+    while true; do
+        spcd_bi__level=$((spcd_bi__level + 1))
+        eval "spcd_bi__value=\"\${SPCD_BANNER_${spcd_bi__level}_INDEX}\""
+        [ -n "${spcd_bi__value}" ] || break
+        if [ -n "${spcd_bi__label}" ]; then
+            spcd_bi__label="${spcd_bi__label}.${spcd_bi__value}"
+        else
+            spcd_bi__label="${spcd_bi__value}"
+        fi
+    done
+    spcd_banner_add "${spcd_bi__label}"
+}
+
 spcd_banner_append() {
     if [ -n "${3}" ]; then
-        SPCD_BANNER_1="${SPCD_BANNER_1}${1}"
-        SPCD_BANNER_2="${SPCD_BANNER_2}${2}"
-        SPCD_BANNER_3="${SPCD_BANNER_3}${3}"
+        SPCD_BANNER_TOP="${SPCD_BANNER_TOP}${1}"
+        SPCD_BANNER_MIDDLE="${SPCD_BANNER_MIDDLE}${2}"
+        SPCD_BANNER_BOTTOM="${SPCD_BANNER_BOTTOM}${3}"
     fi
 }
 
 spcd_banner_close() {
-    spcd_banner_append "╮" "${SPCD_VERT}" "╯"
+    spcd_banner_append \
+        "${SPCD_BANNER_DOWN_AND_LEFT}" \
+        "${SPCD_BANNER_VERTICAL}" \
+        "${SPCD_BANNER_UP_AND_LEFT}"
 }
 
 spcd_banner_echo() {
     echo "\
-${SPCD_BANNER_1}
-${SPCD_BANNER_2}
-${SPCD_BANNER_3}"
+${SPCD_BANNER_TOP}
+${SPCD_BANNER_MIDDLE}
+${SPCD_BANNER_BOTTOM}"
 }
 
 spcd_banner_open() {
-    spcd_banner_append "${SPCD_BOX_DOWN}" "${SPCD_VERT}" "${SPCD_BOX_UP}"
+    spcd_banner_append \
+        "${SPCD_BANNER_DOWN_AND_RIGHT}" \
+        "${SPCD_BANNER_VERTICAL}" \
+        "${SPCD_BANNER_UP_AND_RIGHT}"
+}
+
+spcd_banner_render() {
+    spcd_banner_unset
+    spcd_banner_add_index
+    spcd_banner_add "S"
+    #
+    unset spcd_br__level
+    while true; do
+        spcd_br__level=$((spcd_br__level + 1))
+        eval "spcd_br__value=\"\${SPCD_BANNER_${spcd_br__level}_LABEL}\""
+        [ -n "${spcd_br__value}" ] || break
+        spcd_banner_add "${spcd_br__value}"
+    done
+    #
+    spcd_banner_close
+    spcd_banner_echo
+    spcd_banner_unset
 }
 
 spcd_banner_split() {
-    spcd_banner_append "┬" "${SPCD_VERT}" "┴"
+    spcd_banner_append \
+        "${SPCD_BANNER_DOWN_AND_HORIZONTAL}" \
+        "${SPCD_BANNER_VERTICAL}" \
+        "${SPCD_BANNER_UP_AND_HORIZONTAL}"
 }
 
 spcd_banner_unset() {
-    unset SPCD_BANNER_1 SPCD_BANNER_2 SPCD_BANNER_3
+    unset \
+        SPCD_BANNER_TOP \
+        SPCD_BANNER_MIDDLE \
+        SPCD_BANNER_BOTTOM
 }
 
-# ╭──────────┬─────╮
-# │ internal │ run │
-# ╰──────────┴─────╯
+# ╭──────────┬──────╮
+# │ internal │ step │
+# ╰──────────┴──────╯
+
+SPCD_STEP=1
+
+spcd_step_wipe() {
+    unset \
+        "SPCD_STEP_${SPCD_STEP_LEVEL}_INDEX" \
+        "SPCD_STEP_${SPCD_STEP_LEVEL}_LABEL"
+}
+
+# ╭──────────╮
+# │ internal │
+# ╰──────────╯
 
 spcd_main