SOLIDWORKS Weldment functionality is a great tool to make a weldment structure. A Weldment structure is a unit formed by welding an assembly of parts together. Once you start making a structure using Weldment functionality, SOLIDWORKS generates a list of the components in the Weldment part which is called a Cutlist. In this list you can find important information like the proper cutting length of each profile.
The Cutlist groups identical items together using folders, leaving out items like fillet beads that do not belong on the list. If there is any difference between two parts, like a small hole or fillet, SOLIDWORKS will detect them as separate items and as a result will group them under two separate folders. That may not be the desired grouping specially if the changes are small. In cases like this you can manually rearrange the grouping of weldment parts. This short video shows how to do it.