As with most other integrations, deploying to Google BigQuery is similar to importing datasets. Once you have a flow you want to deploy, you can set up the automatic deployment back into the project you started with or select a new project entirely.
First, select Google BigQuery from the deploy flow step.
Once on the deployment screen, click the 'Select Dataset' drop-down and scroll to the dataset you want if it's already imported or select 'Connect Dataset.'
As with importing a dataset, you must drill down from Project -> Dataset -> Table.
Next, please make sure the column headers match or make whatever changes are needed and click to preview the deployment.
When you are happy, click deploy. Remember, you can output to BigQuery independent of where your initial training data came from.