Hi, I recently bought this,
Note that you can't push more than 500mA through most Arduinos.
Leo..
Check the schematics of some boards that use USB-C.
Power and Ground Pins
The VBUS and GND pins are power and the return paths for the signals. The default VBUS voltage is 5 V but the standard allows the devices to negotiate and choose a VBUS voltage other than the default value. The Power Delivery allows VBUS to have a voltage up to 20 V. The maximum current could be also raised up to 5 A. Hence, the USB Type-C could deliver a maximum power of 100 W.
### The USB Type-C Receptacle/Plug Pins
Note the considerations with USB C. A1, A12, B1 and B12 are all common ground. A4, A9, B4 and B9 are all V buss. Assuming your supply side can provide the current you want just parallel your grounds and Vbus lines.
Read the link which should help.
Ron
In theory, any of the VBus/GND combos should supply the "default" 5V@500mA (or maybe only 5V@100mA), and getting a full 3A requires speaking the "power management protocol" to the other side.
The multiple pins are what give you the ability to flip the connector, and/or deliver more power after negotiation.
In reality, I don't think most power-delivery hosts will limit 5V current (they mostly use the protocol for switching to higher voltages), so you can PROBABLY get more than 500mA on Vbus without additional electronics. Connect all Vbus and Gnd pins in parallel for most certainty...
Thanks for all of your help! I just found out, that ONLY after I connect a USB-C cable, the A4, A9, B4 and B9 pins are connected together (I checked for continuity using a multimeter). @Ron_Blain and @westfw, taking that into consideration, I don't have to connect them in parallel, right?
The reason parallel is suggested is so that the runs on your breakout board can handle the current. For example I want 5 amps no problem any ground and Vbus will do. However if I want more current I parallel additional Vbus lines. So for example if you just want an amp or two you would use Ground and any single Vbus line. You want 10 amps you start paralleling lines. Make sense now? 
Ron
Oh! Thanks a lot for the explanation! If I understood everything correctly then, should the wiring look like this?
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