Not far ago, there was already a similar post answered by me, but can’t remember which one it was.
Generating your wished functionality completely without coding? → Well, i don’t know if this is possible (maybe).
Let’s imagine you have connected your DYNAMIC-PAGE by a DYNAMIC-DATASET.
DYNAMIC-DATASET means → On this page always only (1) item can be shown at once, showing row-data one by one out of your database.
On your PAGE you have added some ELEMENTS like → TEXT, DROPDOWNS, REPEATERS, TABLES, whatever…
Now the most of your elements are connected directly to your DYNAMIC-DATASET.
But your REPEATER can’t be connected to the same DYNAMIC-DATASET, that wouldn’t make any sense, sice you surely want to show more then 1-item inside your REPEATER.
Further → you want to display related content to the selected ITEM.
Let’s say you want to show a PRODUCT → Winter-Socks 
And you want the user to offer different color-choice for your socks.
These COLORS are also inside of your database (ARRAY-FIELD for example, or OBJECT-FIELLD).
Now once a user has selected a PRODUCT, you want to load corresponding COLOR-DATA for your Winter-Socks.
Imagine your DYNAMIC-DATASET has loaded all ELEMENTS (except the repeater).
Now we are at the questioning-point → BUT HOW TO LOAD REPEATER-DATA NOW?
- From here you start CODING.
- Or you add a further → ORDINARY-DATASET <— connected to the ARRAY-FIELD inside your database and to one of the elements on your DYNAMIC-PAGE → which would enable the filtering function to find the right product and show it inside the repeater (in your case an ARRAY or OBJECT holding several/some DATA).