Create Dynamic Search Ad in Google Ads (Google AdWords)

Here are the steps: 

1. Sign in to your Google Ad Account.
2. From the page menu on the left, click Campaigns.
3. Click the plus button, then select New campaign. 
4. Select Search Network. 
5. Select one or more goals for your campaign. Or, uncheck “Use goals” to continue without goals.
6. Enter your domain you want your ads to target then click Continue.
7. Name your campaign, select the locations to target your ads, and the languages.
8. For your bid strategy, choose an automated bid strategy if you want Google to optimize your bids. We recommend the target CPA or enhanced CPC options.
9. Enter your bid limit (optional) and budget.
10. Expand Additional settings and click on Dynamic search ads.
11. Check the Enable Dynamic Search Ads for this campaign checkbox.
12. Click Save and Continue to continue onto the next stage—creating a dynamic ad group and targets.