Alias names for members are stored in one or more tables as part of a database outline. After you create an alias table, you create aliases for members in Outline Editor. Aliases that you create are saved to the active alias table for the outline. By default, every database has one alias table named Default. You can add up to 31 additional alias tables per block storage or aggregate storage database, for a total of 32 alias tables per database.
You can also create an alias table for a database by copying an alias table in the same database to a new name or by importing an alias table from a text file, as described in About Alias Table Import and Export Files.
To create new, empty alias tables for an outline:
Open the outline in edit mode and select the Properties tab.
Right-click the Alias tables node and select Create alias table.
In the Create Alias Table dialog box, specify the name of the alias table.
Click OK.
If desired, set the new alias table as the active table for the outline.
“Setting Aliases” in the Oracle Essbase Database Administrator's Guide
“Working with Alias Table Language Codes” in the Oracle Essbase Database Administrator's Guide