Referencing assembly

I have different solutions created with multiple projects under each solution.

Would appreciate what would be best practice to reference an assembly created in one solution with all the projects in another solution. If I have to add reference to the assembly in all the projects, building the solution creates issue always hence I had to select a project and build.

Ex:

Solution A has projects 1,2,3

Solution B has projects 1,2,3 all these need to reference Project 1 in solution A

Thanks.