I am trying to clone a ribbon cable and have it be very similar to the original. This will require all dimensions to be specified and components placed relative to edges and dimensions. I am unsure how to do this. I am used to the Fusion360 sketch system. If anyone has some pointers, they would be appreciated.
Do you mean a flex-PCB cable?
In that case, use the “Edge Cuts” layer to draw the outline using a suitable point for the 0,0 coordinate.
Use the coordinates at the bottom of the screen to place your parts.