After an issue has been published, you can go back into BusiPro and enter the page number for the ad/editorial.
This can be done in one of two ways: either to an individual item, or to all the ads/eds in an issue in one go.
To add a page number to an individual Item
Adding Page Numbers for all the ads/eds in an issue
Page numbers can also be added in the 'Schedule Overview' report. This allows you to enter the page numbers for all the ads/editorials for one issue in one go.