Having had lasers, plasma and turret punches as part of my job, before I retired, the person who sent you this has done a poor job. The first thing to consider, there is no simple and quick way to turn a file that is a completed assembly into all of the individual dxf files of all the parts ready to be cut out on a laser. Establishing who is going to do this required work and pay for it, is the first thing you need to sort, before you start. Someone receiving a large bill for laser cutting, never goes down well. The normal practice when sending out to have parts laser cut, is to send the dxf files ready to go. If you have a quick look at this project from my profile https://grabcad.com/library/tool-cabinet-trolley-1 there is the model, drgs, dxf files in a zip file. Inside the zipped dxf file there are also pdf sheets with details of each part required. It is the zipped dxf file that I would send off to the sub contractor.
I have never come across any software that will even take a solid works part and with a few mouse clicks turn it into a laser ready dxf file, there is always a bit of work to do. That is why, before you start, who will pay for this needs to be sorted. At least you have the solid works software available if it is decided that it will be you who will be paid to do this work.
I am assuming that you work for the company that operates the laser cutting equipment. The dxf files are created from 2D profiles lifted from the drgs or faces normally. The easiest and quickest way to do this varies between inventor, solid works, or any other software you may be using. The important thing is to check that the dxf files come out at a scale of 1:1 If thes are made from the 2D drgs the scale of the actual drawing view, may not be at 1:1. The units setting if not the same on your machine and the one that the parts were produced on can also cause problems so it always pays, before the machine turns out any parts the DXF's are coming out the correct size.
