Fee Pooling is likely what you’re looking for.
All transactions must be covered by a fee to be committed on the network, but pooling allows a transaction to be constructed with a fee of 0 Algo, as long as it’s grouped with another transaction that pays the fee to cover it.
The other transaction in the group could be a smart signature which which has strong restrictions on the types of transactions it can be grouped with. If done correctly, this dedicated smart signature could be used to pay for the transaction fees.