The Maya help also has information on thecommand.
There can be a few issues when attaching curves.
- Wrong direction
When attaching curves, Maya will connect the end point of one curve to the start point of the other. Sometimes there is a problem with the direction of the curve (which end is the starting point).
Solution: Select one of the curves. Edit Curves > Reverse Curve Direction
- Transformation of attached curves
When transforming (e.g: moving) an attached curve, only a part of the object will be directly affected. This is due to the history of the Attach Curve operation.
Solution: Remove the history from the object. Edit > Delete by type > History.
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