The Substring of Variable or Clipboard action allows you to select a portion of a variable or clipboard for later use.
Select from the Get substring of pop-up what to use as the source of the substring:
If you choose Named Clipboard, Variable or Text then you have the opportunity to select the clipboard or variable or to enter text.
From the pop-up select the nature of the substring. As you select an option, further details may be required. For example, if you select range you need to enter a starting point and then how many characters to include in the substring. The choices are:
Select from the To pop-up the destination for the substring:
If the source was text then the Source destination will not be available.
Tip: leave notes for yourself about what you're doing. Click on the gear icon at top right of the action to select Set Note…. A window appears where you can enter text. Click the OK button to save the text of the note for future reference.