Referencing Main Axis without creating axis

Hi,

I am very new to Solidworks, but have 20+ years experience in Invenotor, so struggling a bit with principle concepts.

 

Is tehre a way to reference X, Y, Z main axis of a assembly to use as axis for component patterns?

 

i want to simply create circular component pattern about Z axis, but currently have no model entity in this location. 

Preferably I want to get this done without creating any other objects like sketches, reference axis ....

 

Cris.