Hi, I'm a newbie in this thing.
I'm trying to create some sub-blocks within a block. The idea is to divide the block to sub-blocks which follow natural features like river/stream, block's boundary, topography etc. And, the neighbouring sub-blocks should share the boundary. I don't how to make it right, snapping is not the right choice for me when tracing the stream and border especially on location with lot of curve. Could someone suggest the best way to make it done? thanks in advance. I posted some photos just to share what I try to do. Thanks again.