Customize T&M Invoice-Newbie needing help!

I apologize if I dont explain myself very well, as I am new to this software. Can sometime tell me of a way to add a description of the work completed above the costs portion of a T&M invoice (3-10-3)? I like that the customer has a breakdown of labor and materials listed on the invoice, however I would also like to provide to them details on the repair. Currently, I run a T&M invoice without posting it and only printing it, go to the receivable invoice (3-2) screen, insert a note with details on the repair along with the breakdown listed off of the T&M invoice, and then put the total billing amount in the 3-2 screen. The way I am doing this, whether it be the right or wrong way, is terribly time consuming. I would really appreciate any suggestions on making this part of my job a little easier and less time consuming. Thank you in advance for any help.