Create a rule in the dashboard
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Log in to the Cloudflare dashboard ↗ and select your account and domain. 
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Go to Rules > Overview. 
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Select Create rule > Origin Rule. 
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(Optional) Select one of the rule templates that address common use cases. Then, review and adjust the proposed rule configuration. 
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Enter a descriptive name for the rule in Rule name. 
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Under When incoming requests match, define the rule expression. 
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Under Set origin parameters, define the origin rule settings you wish to change for requests matching the rule expression. 
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To save and deploy your rule, select Deploy. If you are not ready to deploy your rule, select Save as Draft. If you are matching a hostname in your rule expression, you may be prompted to create a proxied DNS record for that hostname. Refer to Troubleshooting for more information.