Unless otherwise specified, the files will be opened for deletion in the default changelist.

Open files for delete in changelist:

If you have more than one changelist pending when you run the Delete command, a checkbox and a drop-down list of currently-pending changelists will appear. To open files for deletion within a specific changelist, activate the checkbox and use the drop-down menu to specify the desired changelist.

Files in //client-path:

• ...and subdirectories:
  Files in the specified client path and all directories below will be opened for delete.

  This is equivalent to the command line:
  p4 delete //client-path/...

• ...at this level only:
  Only files in the specified client path will be opened for delete. Any files in directories beneath the client path will be untouched.

  This is equivalent to the command line:
  p4 delete //client-path/*

Selected Files:

If files at the current directory level are eligible for the operation (e.g. unopened files for Open for Edit, already-opened files for Revert files), a list of such files will appear.

To include or exclude individual files from the operation, click on the checkboxes for each file, and activate the radio button for the Selected Files option.