Local sld pull from central sld

We are in the process of configuring a brand new sp19 solution manager server. We have a central sld on a dedicated server with several systems already registered on it I created a local sld on the new solution manager server. I want to pull the systems from this central sld server into the solution manager server, but cant' seem to find any documentation on how to do it.

I've read the SLD planning guide, the sld post-installation guide,, and the sld user guide. If there are any steps that document how to do this, I've missed them.

Can anybody help?

--Carl