First projects waste board

For one of my first exercises using Inkscape and Easel, I have created 2 files , one for the thru holes and one for the pockets to house 4 prong T nuts. I am trying to find a simple way to set my zero points for the holes in the bottom left hand corner of my board. Because easel uses the boundary box of the shapes it is difficult to line up. The pockets are 14mm Diam and the thru holes are 7.7. I can do some maths and line them up but is there a way of zeroing on the centres of the holes ie the 7.7 and the 14mm holes. Thanks in advance

All good here, I have discovered the replicator app and it works a treat .