How can I suppress a repeating value from showing up in a list of rows within one group?

Hi -

I need some help in making report output meet user requirements.

Using an .rtf template, I have a row of entries to publish that make up one group.  Below is a table row showing what the .rtf row in question looks like, with the form field help text contained in each item below it:

GP                                                              Report _Category                Detail_Name                Rate              Total Hours         Total Amount       GP

<?for-each: G_DETAIL?>                               <?R_CATEGORY?>            <?D_NAME?>           <?RATE?>      <?QTY?>             <?AMT?>          <?end for-each?>

Is there a way for me to suppress the value of R_CATEGORY for each row after the first that it is the same as the previous row?