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StorageFactory.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;
import { SimpleStorage } from "./SimpleStorage.sol";

contract StorageFactory {

    SimpleStorage[] public listOfSimpleStorageContracts;

    function createSimpleStorageContract() public {
        listOfSimpleStorageContracts.push(new SimpleStorage());
    }

    function sfStore(uint256 _simpleStorageIndex, uint256 _newSimpleStorageNumber) public {
        SimpleStorage mySimpleStorage = listOfSimpleStorageContracts[_simpleStorageIndex];
        mySimpleStorage.store(_newSimpleStorageNumber);
    }

    function sfGet(uint256 _simpleStorageIndex) public view returns(uint256) {
        SimpleStorage mySimpleStorage = listOfSimpleStorageContracts[_simpleStorageIndex];
        return mySimpleStorage.retrieve();
    }
}