Ensure that the project to which the calculation belongs is active. If you need help, you can read our article on switching active projects.

Select 'Saved Calculations' from the project section of the left-side menu.

The project sections is the one below your current project's reference and name.

Find the calculation you wish to copy, click on the down arrow next to the 'Remove' button (at the end of the row) and select 'Rename Calculation'.

Enter a new name for the calculation and click 'Save'.