Geometry in CATIA can easily be replicated by a simple "Copy & Paste" operation.
Scenario: Curve.1 exists in Geometrical Set 1 and the user would like to replicate Curve.1 in Geometrical Set 2. The user simply right clicks on Curve.1 and selects "Copy" and then selects Geometrical Set 2 and again right click and "Paste". This now creates Curve.2 which is an exact replica of Curve.1. As curve.2 is an individual entity not linked to Curve.1, the user can simply update the parameters of Curve.2.