Hi Berdar,
I don't know of any software, but I have designed multiple bight Turks Heads that have 24 bight, 12 bight, and 6 bights all in the same knot. My design was intended to be a mat, but by adding leads, it could be tied as a tapered Turks Head.
What are you thinkng you need for the number of leads and bights in each stage of your project? The rule of design of a multiple bight Turks Head is that each succesive smaller stage has to be a divisor or the larger stage.
Pat