Hi,
You can use the DisplayLogic field on Windows, Tabs and Fields window
Select the window and the sub tab you want to apply the display logic.
Now, if on the parent tab, you have a field IsSpecialCustomer, you can add the following display logic
@IsSpecialCustomer@ = Y
And the tab will be displayed only if the checkbox is ticked.
Anyway, as a good practice, I would recommand to prefix your column name (especially if you're adding the column on a standard table such as C_BPartner).
On my installation, I use several prefixes (XXA, XXR, LFR, ...).
Regards,
Nicolas