Transferring Data from Userform Listbox to Drop-down list in Worksheet

Hey guys!

So my goal in this project is to create a userform that retrieves from the worksheet and also allows users to input data themselves from the userform and into an one column listbox on the userform. When the user is done entering in the data, the data is sent into the cell of their choosing (they enter in the row # themselves and it will always be column H), and creates a drop down list of the data they entered.

So far, I have created the userform and with retrieve, erase a line from the listbox, and a "complete& close" buttons. I also have the listbox and the textboxes made. The "complete & close" button is where i look to transfer the data from the listbox from the userform into the drop down list.

I'm not actually sure if this is possible, so I have been working my way around this problem. What I have now is that the listbox data transfers to a useless column on the worksheet in hopes to use that as the range for the drop-down lists. Unfortunately, I just realized that this would probably not work because the drop-down lists would change with the data in this column. Is there a way to make it so that once these drop-down lists are made, they no longer depend on the range and do not alter until the userform calls upon that particular cell again?

I know this is a complicated problem, but please ask for you guys to help! I'm pretty much a novice in VBA and I don't completely understand the limitations of Excel VBA. Help would be much appreciated for this problem that has been giving me headaches for days.

Thanks!