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I just doesnt know that I can put it like @100,2. So if want slope 1:1.5 i just type @1.5,1 and that it. Thanks!

That is definitely how I've learned, cribbing from other routines. What are you still trying to accomplish? It seems that if you are creating an xline with a specific slope, it is just as easy to type: XLINE (enter 1st point) @100,2 I'm not sure how you would speed up much other than avoid typing the @ symbol. Unless you want to add multiple xlines of the same specific slope (and didn't want to just use the copy command.)

Another idea as its a simple shape not a "U" shape then a average centroid could be found quickly so this would give a direction for the text cen pt -> pt angle just use co-ords of pline. As you pick a point it also picks the pline hence co-ords. Just use a radial offset point for the text location it could check the brg and offset more to make text correct offset to outside with a bit of a fuzzy factor. Technically could look at brgs of the two matching line edges and get a 1/2 angle.