Track View > Dope Sheet > Specify a time block. > Time: Dope Sheet toolbar > Delete Time button
Use Delete Time to delete a selected block of time and any keys inside the selected block. Keys to the right of the deleted time move to the left.
Note: The deleted block is not copied to the clipboard.
To delete a block of time:
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In Dope Sheet mode, highlight one or more item labels in the Controller window to specify tracks for time editing.
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Use Select Time to specify a block of time.
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Keys in the specified time block are deleted, and any keys to the right of the block move leftward.