Linked geometry is a by-product of importing or linking a drawing file to 3ds Max. It is a child object, or subcomponent, associated with VIZBlocks or Block/Style Parents.
When you select a linked geometry object, it offers no parameters on the Modify panel. You must first add an Edit Mesh or Edit Poly modifier to the object or collapse the linked geometry object to an editable mesh or editable poly in order to access sub-object levels. If you add a modifier to linked geometry, the modifier is applied to all instances of that object.
The only direct control you have over linked geometry objects is the Reset Position option that is used to negate and basic move, rotate or scale transforms. See File Link Manager Utility.