Delete side transform

I feel like this is a basic ask but I can't seem to figure it out. I have a side transform defined that creates a new node when the alias is typed, how can I do the reverse if the delete key is pressed? For instance, if I have the text "1+2" and the cursor is to the left of the + symbol and I press the delete key the underlying + expression is removed and replaced with 2.

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Official comment

You should define an action map, in that action map declare an action for the DELETE event and attach the action map to the cell that represents the "+" symbol.

 

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Thank you, that worked! At first I couldn't find how to define an action map, but figured out I had to right-click the Editor node in the Logical view and create a new Cell Action Map from there.

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