Trim edge

 From:  brash
5792.1 
Hi All,

When I construct a network from four curves I get a solid with single edge.
When I trim a solid on surface near edge I get one edge, but when I trim surface on edge I get two edge.
Pls help:
How I can choose one curve from four curves which be single edge of solid?
How I can blend three edges on two solids?



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