The system will accept power from only one connection at a time, so you can't add two power inputs to total what the system needs.  As the other reply indicated, a specific answer requires knowing what model system you have, but if it needs a 180W adapter, it is all but certain that regardless of that specific, you can't power it over a docking station alone.  
Getting a slow charge warning with my 180w laptop using 180w docking port. Now understand the power to the docking port is 180w and not 180w to the laptop. Could I use a second docking station with a combined power to laptop of grater than 180w to get rid of the slow charging warning?
Slow charge warning 180w laptop 180w docking port