Variable range based on data from a cell

[VisualRealism]

Hi,
I'm asking for your help, I'll try to explain as detailed as possible what I'm in need of(and couldn't figure out a way to do it yet).
So, I have a table that contains a number of products, for each product the yield is introduced each week, I would like to achieve to get the top 4 worst performing products out of the table for a specified week(like selecting a week from somewhere and based on that data(the value of the week) it selects the 4 worst for that week and enters them in 4 different cells) and to show the name of the product above the value that it extracted from the table.
The part with getting the worst performing ones is easy with =SMALL(range:range,nr in top) but this way I have to change the range each week, for example I'm on column Y this week so the formula is =SMALL(Y76:Y96,1) for the worst one but next week it should be =SMALL(Z76:Z96,1). Is there a way to select a week and after that the formulas range changes automatically? Let me know if something is unclear or more info is needed.

Thanks a lot in advance