Change in Generic Templates % Percentage Values

Hi All

We are using PSFSCM 9.2 image 0 PT 8.53 would like to change and insert variable figures in the approval email generic template. Since, system does show %1, %2 so on and so forth and use it in a template we would like to add %7 with the value opr_id_entered from the req_hdr table/record. Kindly review below screenshot as to which screen I'm talking about:

So should I use plus button and insert a %7 and OPR_ID_ENTERED_BY and than use it in template where I want to or leave this idea OR how to incorporate/introduce opr_id_Entered_by