Hi @Anonymous
Please refer this blog: https://vblogs.in/configure-subgrid-on-basicentity-form-in-powerapps-portal/
You have to create Form MetaData and select Subgrid and follow steps which is given in above blog.
Step1: Go to your Basic Form
Step2: Click on Basic Form Metadata tab and click on "+ New Baisc Form Metadata".
Step3: Select Type as "Subgrid" and select your subgrid name
Step4: Click on Edit and select your Edit Form which is for your subgrid entity
Step5: Clear the cache and check.
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