Formula to show a date range based on the amount shown in another cell

Attached is a excel file that has a working formula for tracking cashier variances. I edited out names etc.

I added a new cell called Track Back on the employee search sheet.

What I want to do is only show variances for the amount of days back selected in the Track Back cell.

For example if I select the last 30 days, only the last 30 days would show up below in the sheet.

I am not sure if this is even possible based on the forumla that is already on the sheet. I couldn't figure out a way of doing it. But there are a lot of people on here much better with excel than me

Thanks for any help with this, I really appreciate it.

Nick