The Toggle Multiple Arm Markings menu item is only available on systems that have entered into multiple arm mode.
If you have commands assigned to a particular arm and you want to assign them to a different arm, do the following.
Place the Edit window into Command mode.
Select the Edit window command you want to add.
Select Operation | Toggle Multiple Arm Markings.
When you select this option, PC-DMIS connects all of the highlighted commands to the other arm.
If you don't highlight any commands, PC-DMIS connects the command where the cursor resides in the Edit window.
You can assign most commands to be executed by Arm1, Arm2, or both arms. For example, you could create a PREHIT or ALIGNMENT command that applies to both Arm1 and Arm2, or to just one of the arms.
You cannot assign certain commands to multiple arms. These include features, hits, dimensions, and probe commands.