Modifying Ordinate Dimensions
If the ordinate dimensionings in solidworks are not made in the sketch , but only in the drawing,
and then I understand that I have mistaken about the zero point, is there any solution to change or invert the starting point, without doing everything again ?
Use Move/Copy Feature (see attachment) and move the part to the Center Point.
Answered with a tutorial: https://grabcad.com/tutorials/modifying-ordinate-dimensions
The zero of a horizontal ordinate dimensions needs to reattach to another item like a point, vertical line, or tangent edge.
If you could post a picture of what you have, and describe how you'd like to change it, I think it will be easier to determine if it is possible.