A contract "depends on" is a contract that shares allotment with the "master contract", but unlike the derivative has its own tariffs.
To create a new contract "depends on" you need to create a new contract and choose in the main options of the contract "share allotments with", the contract with which to create the dependency.
Once the dependency is created, the contract will be visible as a derivative but recognizable by the empty triangle at the top left of the contract id