list alternatives to textboxes or merged cells in shared file
 

I have a shared file that contains a couple of pivot tables but I need to
keep the file shared AND provide users the ability to enter text in a given
textbox that should resize based on the output from the pivot table. I can
not merge and unmerge cells on a shared file, and the text box route seems to
be limited by the properties available. Are there any other options for
delivering this functionality?