Jan 27, 2020 02:05 AM|Yang Shen|LINK
It's hard to tell what you should do without the code. But mgebhard's suggestion is helpful, in my opinion, you can try the nested repeater which is very flexible and easy to operate.
You can refer to Implement Nested Repeater (Repeater inside Repeater) with example in ASP.Net using C# and VB.Net
for more information.