# NIM

##### Map a sub-mapping

1. Create a mapping for the table that will be mapped onto an attribute in another table.

For example, the users_phones_set function for the users_phones table in a target Google system.

2. Repeat step (1) for any additional tables that will be mapped onto attributes.

For example, the users_externalIds_set function for the users_externalIds table in a target Google system.

3. Edit (or create) the mapping containing the attribute(s) in question. See Edit a mapping.

For example, the users table in a target Google system.

4. Click the relevant attribute's Source field and select mapping. Then click its Value Specification field and select the relevant mapping that you created previously.

For example, map the google_users_phones_set mapping onto the phones attribute.

5. Repeat step (4) for any additional attributes.

For example, map the google_users_externalIds_set mapping onto the externalIds attribute.

6. Click Save.