Hi Jim,
You shouldn't have to re-create a form from scratch to change text. However, you will have to edit the appropriate cell(s) to get what you want. You are correct that you cannot drag-and-drop particular account ranges onto an existing sheet - this functionality is reserved for new sheets.
Once an account group is dropped onto a sheet, the group titles and sub-titles are created as simple text and cannot be automatically updated based on changes to the Account Group itself. If the text 'A/R' is a title or sub-title, you could use the Edit / Replace function to look for all occurences of 'A/R' and replace with 'Accounts Receivable'.
If the text you want to change is for the Account Description when the form is in a summary mode, click on the cell where you see this. I suspect you will see a formula such as =GLDESC("A/R",3,$B10) which will output 'A/R' in summary mode, and the real account description when expanded to detail mode. Should this be the case, all you have to do is edit this formula and replace 'A/R' with 'Accounts Receivable'.
If you are not sure about how to make this change, please click on the cell that contains the 'A/R' text you want to change, and let us know what you see in the formula field on the toolbar.
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Regards,
Softrak Tech Support