Drawing line displaced from base point

Hey, I would like to know how to draw a line following the AutoCAD scheme:

line -> from -> choose base point -> set displacement

so it looks like i would like to draw a line starting at displaced point (e.g. @100,100) from base point which i can select (e.g 1200,300). How cana I do it without giving absoulute coordinates (1300,400)?

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