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Russ,
As far as I know, there is no Macro included in DeltaCad or posted on our pages that measures lines.
With that said, if you want to draw a line to a specific length, if I understand your question correctly, you need to enter value in the input area at the bottom where it asks for either the length (vertical/horizontal line mode - one value) or the offset (angled line mode - two values separated by a comma) to draw a line from it's starting point to a specific length or offset point.
By starting and dragging a line to some random point will always require you to use the dimension function to measure it. Subsequently any randomly placed angled line will always require you to use the dimension tool to measure that angled line's length.
Alternately, you can monitor a line's actual length, as displayed and changed at the bottom while dragging it and before clicking again to set it's final endpoint. Note: The accuracy of that value will be determined by the current view/zoom scale value, of which, btw, can be adjusted up or down on-the-fly in the box next to that displayed value.
I hope this was helpful. However, if this doesn't answer your question, please ask again and try to be more specific.