Multi Select Between Modules

Multi Select Between Modules

Hi, 

I'm not sure if this is possible, but I want to "import" or "mirror" the multi select options from one module to another. 

For example...

I have Module "Clients" with a Multi Select Field of "Enrolled Services"

I also have a Module "Services" with a Multi Select Field of "Enrolled Services."

"Clients" already has the Services selected and I want to "import" or reflect the exact same services in the "Services" module and ideally they would stay updated anytime a change is made. 

Currently, I see I can do a Workflow, but the multi-select option does not show up when I go to add a field.