Optional tool lenght measurement

Hello guys,

Its been a while i digged in to my configuration, so forgive me if i am a bit rusty.

My machine is already running for 4 years or so. Its a manual toolchange machine that runs gmoccapy with auto tool measurment.
I have collected a few BT40 holders over the years and therefore i do not need to measure each tool i put in. It is already in the tooltable and so the lenght is already known.
But for exemple for my drill chuck i change the drills so i need a measurement.

How do i get that at the start of the toolchange routine. When i am asked to change to tool ... I can choose if i want measurement of this tool or i want the tooltable to handle it?

Mark