The current StockList demo page explicitly lists the names of all stock items to which it subscribes,
although it uses fake names (i.e. "item1", "item2", ... to make it simple).
Hence, you can change the list as you like.
If the page does not know the names of the stock items to which it has to subscribe,
but it only knows that they belong to a specific "group",
then it can use the group name in its request and let the Metadata Adapter decode the group name into an item name list.
The Data Adapter would not be involved, as it just provides updates based on the item names requested.
However, this technique is only feasible if the page knows how many items are involved, so that it can allocate the needed room.
Otherwise, the decoding of the group name into the stock items involved has to be performed in a previous step.
Alternatively, the COMMAND mode can be leveraged, by treating your group in a way similar to a user portfolio. In this case, the
PortfolioDemo could be your reference.