To assign your own keyboard shortcuts for commands, perform the following steps:Click on Command Mapping in the Preferences menu window.
Open the User defined tab in the Command Mapping dialog.
Click Add. The Add User Defined Key dialog is displayed.
Select the modifier key that you want to use from the Modifier keys options.
Select the key that you want to use from the Key drop-down list.
Click OK. The Commands List dialog is displayed.
Select the command that you want to associate with the new layer key from the Commands list.
Click OK.
