>Hi,
>
>My app has many (100+) reports. There are all in the main menu Reports -> Reports Group A, Reports Group B, and so one. Under each Group there is a list or reports. Users are lost or do not know where to look for this or that report.
>Plus, the users - mostly - use one to 5 reports on the regular basis.
>I would like to allow them to add certain reports to a short menu list (let's call it Custom Reports). The way I envision it, a user would grab a report and drop it on the Custom Reports. Or, if necessary, delete a report from the Custom Reports list. All of the previous should be done at run time, by a user.
>
>Is it possible? If yes, how?

You could consider a most recently used (MRU) list:
- Keep track of X MRU reports
- On the fly, tack those to the bottom of your Reports menu pad/list. Normal convention is most recent at the top

Office apps do this, and Windows File Explorer has the Quick Access section so users should be familiar with the concept. It has the advantage of not requiring any setup by the user, it automatically adapts to the reports they actually use.