'create two nft collections from one smart contract (erc1155) in OpenSea

I want to list two collections on Opensea but instead of creating two smart contracts for that, I want to create only one (to save gas fees of uploading a contract).

the only two ways I found to create a collection on OpenSea are:

import an existing contract and it will automatically detect all the minted NFTs and display them.
create items manually with OpenSea UI and add them to a collection that is also created from the UI (without any code required)

is there a way to import an existing contract and select prefixes of ids or a range of ids (of minted NFTs)

and show them as one collection in OpenSea? or there is another marketplace that supports this?

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'create two nft collections from one smart contract (erc1155) in OpenSea

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