TPC can handle any number of nested commands in Drawing View. Say you are selecting objects to place in a group and need to zoom in. Choose the zoom in command. The current command is suspended while you zoom in. Once the zoom in command is finished, the suspended command resumes.
If you cancel a nested command, TPC returns to the previous command. You can cancel it also or choose a different nested command.
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Using Drawing View
Smart Drawing Objects
Working with Drawing Objects