How To Automatically Add Row If Last Row Is Filled

I'm trying to build a invoice template for my business. Trying to make it as simple to use as possible for my staff to input the data. Currently they will manually type in everything but later on I would like to make the spreadsheet have available drop down boxes for the equipment and it will auto fill the hourly rate in.

Right now my main issue is I have the invoice template the way I would like it, but there are only 5 rows in each category. I would like for it to, once the last row in each category is filled, make a new blank row with the exact formatting of the one above it. Then continue to make blank rows if that subsequent row is filled in as well.

Basically, to better describe what I'm looking for, say I have 15 employees on the job and 10 pieces of equipment. I currently only have 5 rows in each category and would like them to expand out automatically without doing a copy rowinsert. It doesn't matter if the page expands to multiple printable pages as long as it doesn't get jarbled in the process.

I am very new to Excel and not even sure if this is possible. I would also need this to carry on with the .xlsm file so that my other employees can use this invoice template on their laptops.

I attached the invoice template I created so what I'm describing can be better understood.