Keeping assembly drawings and work instructions linked in PDM Standard

I am using PDM Standard.

We typically have an assembly (SLDASM, SLDDRW) plus related assembly instructions (in MS Word or PDF).

How do you recommend we keep these linked together in PDM Standard?

Should we use the same part number, or is there another way to link documents?

Thanks for your help

SolidworksSolidworks Pdm enterprise Pdm