Custom LU & Tab in Shop Floor Work Bench

Hi,

I’m trying to create a custom tab on shop floor workbench. It appears that I can do this in Apps 10. However, I can’t seem to enter data in these new fields. Here is an example, if I have a shop order and operation opened on the screen, I want to be able to check these boxes and have additional text fields.

Is this possible? What am I missing?

Thanks,

Mike