[quote=Ink Blood]
Alright. Now if I buy the company upgrade, that means I get more units with training?
[/quote]

Let's use an example. It always helps. I'll go with a simple type of unit just to save on the maths :p

We have 2 units.

1 Generic. 1 Skilled.

Both have the same skillset.

Basic Blasters
Special Weapons
Personal Armour.

A unit of 10 (Standard Unit) would be 20 Points for the Generic troops, or 40 for the Skilled Troops.

We then apply a Platoon or Company modifier.

Generic Platoon : 80 Points for 45 men. (5 more than the same cost in basic units)
Skilled Platoon: 160 Points for 45 men. (as above)

Generic Company: 240 Points for 180 men. (4 Platoons) If you spend it on 12 Generic 10 man units you'd only have 120 men.
Skilled Company: 480 Points for 180 men. (As above basically)

EDIT: 

The downside with Platoon or Company sized units is they have to be used as Platoon or Company sized units, you can't sub-divide them, they're trained to operate in those groups.