Need help to create a relationship between one to many data files.

Hi Yuiitsu ,

I understand that the last few solutions, including the one based on the sample file and screenshot provided, may not have matched your exact requirement. I truly appreciate your patience throughout this process.

I would be more than happy to continue working with you to get it resolved. On the other hand, could you please share more details about where you're facing the issue or what part isn’t working as expected? We’ll be happy to help you further.

Thank you.