When you originally place a component into an assembly, it gives option for "Ground at Origin" but once the component has been placed, you can ground it where it sits but not ground it at the Origin. It would be really convenient to have this option for components that are already in an assembly, especially when the grounded-at-origin part has been deleted, without having to delete and place them again. (Included picture shows the options list I get *after* a component has been placed into an assembly, no Ground at Origin option, can only ground in place.)