# Mapping new data types in the AWS Schema Conversion Tool
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You can create multiple mapping rules in a single project. AWS SCT saves mapping rules as part of your project. With your project open, use the following procedure to add a new mapping rule.

**To create mapping rules**

1.  On the **View** menu, choose **Mapping view**. 

1.  In the left panel, choose a schema or a database to add to the mapping rule. 

1.  In the right panel, choose a target database platform for the selected source schema or database. 

   You can choose a virtual database platform as a target. For more information, see [Mapping to virtual targets in the AWS Schema Conversion Tool](CHAP_Mapping.VirtualTargets.md). 

1. Choose **Create mapping**.

    AWS SCT adds this new mapping rule to the **Server mappings** list. 

 Add mapping rules for all conversion pairs. To create an assessment report or convert database schemas, choose **Main view** on the **View** menu. 

AWS SCT highlights in bold all schema objects that are part of a mapping rule.