Of course after you take the time to post a question you find the answer :)
I was reading through the documentation on Path Expressions and
found the following, which solved my problem:
Using relative paths
You can use relative paths expressions to specify sub-documents or parent documents:
Examples:
. - current path
.. - parent document of the current path
./Product - document Product under the current path
../Product - document Product under the parent document of the current path
./% - all documents under the current path
../% - all documents under the parent document of the current path