Isn’t there a trick where before placing the first point of a line, you lock it to be along X = 0 and Z = 0, for example? Isn’t it typed into the command line?
Also, is there a reason you can’t start a Polyline with Perpendicular/angled/Normal?
I guess you’re looking for Point filters:
Point filters extract individual x, y, and z coordinate values from different points to create a new, composite point.
The following filters are possible:
.x
.y
.z
.xy (.yx)
.xz (.zx)
.yz (.zy)
.wx
.wy
.wz
.wxy (.wyx)
.wxz (.wzx)
.wyz (.wzy)
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That’s the one!