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Contextual
Spline Contextual Menu

Combine Paths
Makes two splines into one without changing their appearance. This command is available when two splines are selected.

Connect Paths
Makes two splines into one by connecting the start of the second object to the end of the first object. This command is available when two splines are selected.
Split Path
Splits a spline at the selected point. This command is available when one point on one spline is selected.