How to Add Existing Schemas
Sometimes you will want to add an existing schema to an existing BizTalk project. This topic describes the required steps.
To add an existing schema
In Solution Explorer, select the BizTalk project to which you want to add an existing schema.
On the Project menu, click Add Existing Item.
In the Add Existing Item - <BizTalk ProjectName> dialog box, browse to the location of the schema, select the schema, and then click Open.
The existing schema is added to the BizTalk project but is not automatically opened in BizTalk Editor.