Hi Daniel N,
Is your requirement that nobody can use the Workbook while user A is in it? This seems strange from business point of view. Usually user who what to enter data in different Cost Center and/or different Quarters and /or different Versions etc. are able to do this. Can you please clarify that requirement with business.
Now, Work status and Data slice are 2 different tools of preventing data from being changed after certain events. Why do you want to link them? If you have levels of approval that follow hierarchy of some Dimension, say Cost center, then Work status can be more suitable for your purpose. If you need to lock data based on some other criteria then Data slice can be better for you.
Regards,
Gersh