Hi Brayan,
Thank you for reaching out to us. To create a child account, first log into your manager account in the Google Ads UI. Once you're logged in, please click "Accounts" on the left hand side.
You then should click the blue "+" button and click "create new account" to create a new child account. Let me know if you have further questions.
Thank you,
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| Bryan Li |
| Google Ads API Team |
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