How do I make a composite key with SQL Server Management Studio?

Question

How do I make a composite key with SQL Server Management Studio?

I want two INT columns to form the identity (unique) for a table

Answer 1

Highlight both rows in the table design view and click on the key icon, they will now be a composite primary key.

I'm not sure of your question, but only one column per table may be an IDENTITY column, not both.