I've created "Storage Bases" (1 SY and the rest resource storage) and "Resource Colonies" (monoliths)...
I like to put a SY on every planet, no matter how insignificant, just because it provides a larger shipbuilding capacity and I don't have to worry when I go to the construction queues to multi-add a ship that I haven't turned off "planets (without shipyards)" in the build queues window and lose my selection
Why can't you select a group of SY's by clicking the first then shift-clicking the Last, and make control-clicking select one at a time?