Use the Hierarchy menu to make one assets positioning dependant on another.
You can drag & drop OBJECTs in the Hierarchy to create Parents and Children. Drag your selection and drop it on an OBJECT in the Hierarchy.
When an OBJECT is a Parent, it has an arrow next to it. If the arrow is pointing the right, then the Parent OBJECT Children display is collapsed.
If the arrow is pointing down, then the OBJECT Children are displayed below, with a
on the left of their name. This icon is always displayed vertically below the arrow to show which Parent it is attached to.
It is possible to combine both Parent and Children. In this case, the Child icon is still there, but the Parent arrow is displayed on the Right, as above.