Hi all i need help positioning x y , I am using version .92 for plasma cutting . i am trying to lay out bolt holes in the X Y coordinate but it always puts the bottom left corner of the selected object on the  X Y position not the center . is there a way to designate the center of selected object to go to X Y location .

The SVG specification for object coordinates is the lower left.

If you are typing the coordinates into the control-bar, you can add the radius to the coordinate as an expression, so you don't need to do the math outside of Inkscape.

e.g. if the X coordinate is 50 and the radius of the hole is 5, you can type into the X field: (50+5)... Inkscape will return the sum.