Linking the Revit model of different discipline is common for visual check, coordination etc…
If the project is a Central model then generally we assign the Link to Workset for many reasons.
To assign the workset to element we generally select them and from the Instance property pallet change the workset.
But for links the case are different you will assign them not only in Instance Property but Type Property as well. the exercise is double and hope there's an answer.