What is the issue you're facing?
I've have several contracts and would like to be able to link them so that there are parent and child contracts.
Solution
You'll need to have your contract created.
Then to link it to another contract you'll need to scroll down to the Hierarchy section.
If the contract you are in is to be the parent contract under the children section you can use the drop down to select which contract should be the child contract.
Once selected it will then look like this.
If the contract you are in is meant to be a child contract you can choose which contract will be it's parent from the Parent drop down.
Once selected it will then look like this.