Parametric Cell Studio, starting up question, place a parametric point??

Hej Guys,

I am trying to figure out how much I can do with PCS....

and just started to learn it. after some youtube video. I started my own.

and got stuck alreday on the 3rd step of my design.

I am planning to make a steel plate with some bolt holes. my thought is Create the plate. Create bolts. place them with C/C distance.

I did what tutorial videos, draw path, set the path as the reference. and i want to place either a circle or a point for the bolt holes.

but the center of circle or the point seems to be constrained with only one reference. please look at the picture.

I can create a distance from the center to the edge of reference along Y axie... but after that, I cant make the same thing alont x axie.... which means the point/ circle wont be adjusted after different input....

can anyone give me some guide on this. thanks??