1. On the Integration tab click on Additional Columns tab.
2. Click on the Add Additional Column button.

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3. The Additional Column window will open.
4. Name – Enter a name for the column.
5. Tab off the Name field to enable the Type field.
6. Type – Select Multi Lookup from the Type dropdown list.

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7. Organization – Either select the CRM organization that this lookup should always run against or select Runtime Organization to perform the lookup against the destination organization.
8. Entity – Select the entity to perform the lookup against.
9. Click Add Attribute – Select an attribute and associated column.
10. Return Fields – Click the Select Return Fields dropdown list and mark the checkbox for the fields to be returned from the CRM Server.
11. Return error if no data found – Mark this checkbox if an error should be returned if no data is found.
12. Save the column information.