> For the complete documentation index, see [llms.txt](https://help.qonic.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.qonic.com/documentation/qonic-application/modeling/modifying/subtract.md).

# Subtract

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1. Under the *Modify* icon, click *Subtract* or use the <kbd>X</kbd> shortcut
2. Select the parts you wish to modify, these will be highlighted in green. When ready, press Enter
3. Select the parts you wish to subtract from the first selection set, these will be highlighted in blue. When ready, press Enter

> **Hint:** You can use the Browse panel to assist with the selection of either selection set.