What have you tried? I know you said you were looking for documentation, but have you tried creating code or functions to perform the task you need?
First thing I'd try is attempt to record the action and then see how TestComplete operates with it.
Keep in mind LoadRunner and JMeter are both load/stress testing applications intended, specifically, to operate on a low level. TestComplete is a functional/regression test tool that interacts with the UI of the application in order to execute functional tests. If you want something that has the functionality of LoadRunner, SmartBear has the LoadComplete tool that might meet your needs better.