Yes! You can add multiple Google Ad accounts by heading to Data Warehouse -> Integrations and finding the Advertising switch. 

Click the red "Remove" button and then turn the switch back on (see attached). Go through the steps, select the accounts you want to add and you should be good to go! 

Note: In order to add an additional Google Ad Account the account needs to be shared with a single Google account. Here is a helpful link to share your access:
https://support.google.com/google-ads/answer/6372672?co=ADWORDS.IsAWNCustomer%3Dfalse&hl=en

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