How to Create Serial Numbers in the PRO Version of the 2L Engraving Software. This Step 5 of the Tutorial shows how to create incrementing serial numbers using the 2L inc. Engraving Software. With the push of a button, the serial numbers can be saved as either a single g-code file containing all the different serial numbers or each individual serial number can be saved in its own individual nc file. If you choose to save the serial numbers into individual files, the files are named as the serial number to allow easily calling them out as a subprogram from your main machining program using a simple counter. View complete details at: https://www.2Linc.com