To edit/update a substitution variable, follow the steps below:
how do i update the @curmth substitution variable
Navigate to Maintenance > Report Administration > Cube Settings.
Click the Substitution Variables tab.
Select the substitution variable you want to update.
Click the Edit icon.
Enter an identifier in the Code field.
Select the Substitution Value by opening the Hierarchy dialog page. Use the hierarchy or filter functions to search for, and select a specific value.
Click Select.
Click Save.