The Schematic symbol has 4 pins to match the number and numbering of the pads in the PCB Footprint. You can either: 1. connect just 3 pins (1, 3 and 2 or 4) in the schematic and put a Not Connected (green "X" symbol) on the unconnected pin which will then leave that pin out of the netlisting and so ignore it in the PCB or;  2. connect pins 2 and 4 to the same (collector) net in the schematic so they will both be netlisted and connected together in the PCB. The choice of which option depends on the collector current that you are passing through the trannsistor and the power dissipation that this causes in the device. If it is passing more than about 100mA or dissipating more than about 100mW then it should have both collector pins connected in the schematic and routed in the PCB to reduce the electrical and thermal resistances of the tracks to the device. In my opinion this schematic symbol is a horrible attempt at rendering this type of device, which makes schematics almost unreadable. If it is a transistor then it should have a transistor symbol. If it is a an opamp then it should have an opamp symbol and so on. :( This topic describes and illustrates a much more professional way to deal with devices that have multiple pins assigned to the same functional device pin: [https://easyeda.com/forum/topic/How-to-avoid-DRC-errors-when-connecting-to-PCB-Footprints-a-k-a-PCB-Libs-90bf944fe3644b21a7d27a9e9d8df8d6](https://easyeda.com/forum/topic/How-to-avoid-DRC-errors-when-connecting-to-PCB-Footprints-a-k-a-PCB-Libs-90bf944fe3644b21a7d27a9e9d8df8d6)<br> <br>

Hi! It is usually recommended to connect collector pin to the larger pad and ignore the smaller collector pin between the emitter and base. Regards, Markus Virtanen HW / Electronics Designer

Thanks guys, much appreciated.