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EdgeCAM allows adjacent surfaces to be joined into a single machineable surface entity, using the Joined (Surface menu) command.
Note that you cannot use this command on surface groups, as a general surface group might not have all surfaces joining at common boundaries, or have all surface members untrimmed.
The Joined command is mainly intended for part created in other CAD systems and imported via IGES. Some CAD systems divide a single logical entity into a patchwork of smaller surfaces, usually B-spline surfaces. Combining them into a single entity simplifies subsequent surface manipulation.
To be able to join surfaces, these conditions must apply:
The surfaces must be untrimmed
Adjacent surfaces must match parametrically along a common boundary
Surfaces must join to form a rectangle in parametric space.
These conditions are shown below: