Hello,

I'm trying to gain proficiency w/ GRASS vectors & layers. I've read 
https://grass.osgeo.org/grass76/manuals/vectorintro.html and 
https://grasswiki.osgeo.org/wiki/Vector_Database_Management a few times, but am 
still not clear on how to create layers.

I have three vector layers: BASINS, STREAMS, and OUTLETS. All basins have 
outlets. All streams have outlets. Not all basins have streams (some small 
basins have no streams but still have an outlet).

I can merge these three with v.patch, but they're all in one layer. I thought 
it might make sense for each to exist on its own layer. Or perhaps my 
misconception is that they cannot - it is the attribute tables that exist on 
separate layers?

If someone can provide an example how to combine these there vectors, or link 
to a tutorial, I would be grateful.

Thanks,

  -k.
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