Hello Ashutosh Sharma,
While using Azure AI Foundry, inside playgrounds section, while in setup phase after deploying the "gpt-4o-mini" model, please add your data which needs to be processed under "Add your data" section(highlighted) and after that you will be able to find an option to deploy using the option "to a new copilot in Copilot Studio" under the "Deploy" tab(highlighted).
Please refer the attached screenshot.
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