how to make a plastic injection mold in SolidWorks
Here is a tutorial from a few years ago. hope it helps.
ww.xmhuaerjia.en.alibaba.com, this company supply plastic injection mold design service, you can have a look at, we worked with them before, pleasant cooperation
Most professionals in China use NX, and some use CREO/PROE .
Solidworks certainly can do it as well , but might be the best software for this job.