Hi Guy,
Sorry for the delay in answering this post, I had to set this up in my own account to know for sure how this would be done. I believe I have part of your solution, but I would like to confirm this is along the lines of what you are looking to do.
In my example, I took the stock WorkOrderV3 template and made a copy of it (just in case I mess anything up during my customization, I can always revert back to this original version).
I first added an additional label to the GroupHeader1 section, to be my Column Header for “Customer Equipment”. You will likely have to change some of the label properties, change the font color to white, as well changing the label so it gets “Send to Front”.
I then went to the Detail1 section, I resized my original fields to make room for my new field, then from the right-hand side, under Activity.JobItems.Activity, I found the field labelled “Customer Equipment” and dragged this into the correct slot for the Detail1 section.
This should be it, I saved my template, changed my settings in Method to point to this new saved template, then ran a test…Here is a small screenshot of my end result. Please take a look at this and let me know if this is along the same lines as what you are attempting to do. Also, you might want to double check this Help Center Article, it has a detailed explanation of what the Customer Equipment option in Method is all about.
-Ben