You can copy custom-defined functions to any Essbase Server and application to which you have appropriate access. You can also copy custom-defined functions across servers as part of application migration. See Migration Wizard.
To copy custom-defined functions:
From Enterprise View or a custom view, select the Essbase Server that is associated with the functions that you want to copy.
Right-click, and select Edit, and then Functions.
In the Custom Defined Function Manager window, select one or more functions, and click Copy.
In the Copy All Functions dialog box, select the Essbase Server and application to which to copy the functions.
Optional: To overwrite functions that duplicate the names of the copied functions, select Overwrite existing functions.
Click OK.
create function (MaxL) in the Oracle Essbase Technical Reference