[V8i VBA] Restrict line direction?

Hi

I have 2 days remaining before I leave my current employer and I am trying to add an extra functionality to a VBA project for a colleague before I leave.

I want to simulate the create of a line (without actually creating the line) to determine the length of a table but I would like to restrict the direction to the X axis only to prevent an incorrect vector length.

The Key-in command "ACCUDRAW LOCK Y" seems to achieve what I am looking to do but I was was wondering if there a simple elegant VBA method to do this?