PowerDesigner supports SQL Server 2005 synonyms through the standard synonym object.
Synonyms can be created for the following types of objects:
Assembly (CLR) Stored Procedure
Assembly (CLR) Table-valued Function
Assembly (CLR) Scalar Function
Assembly Aggregate (CLR) Aggregate Functions
Replication-filter-procedure
Extended Stored Procedure
SQL Scalar Function
SQL Table-valued Function
SQL Inline-table-valued Function
SQL Stored Procedure
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Table
For more information about synonyms, see Synonyms (PDM).