Someone correct me if I'm wrong. If you have multiple LiPo cells, you need a balance charger. 3 1800mAh cells in parallel will charge with a standard charger but will have a longer charge time. Possibly 3 to 4 hours at 1A, that's just a guess. However, all the cells may not charge evenly thus the need for a balance charger. I suppose you could connect diodes to each battery and have 3 different charge ports to get all of them at max capacity. <-- yet another guess...
Here please read this:
https://en.wikipedia.org/wiki/Battery_balancing
As for how to create this pack, you just need the 3 1800mAh cells. Connect all the red (+) together, then connect all the black (-) together. You now have a parallel connection on your battery pack. Be mindful that heat is an enemy to LiPo cells. They can overheat and either catch fire and/or explode on you.