You pay the price for both the battalion and the Wargrove. So, a Heartwood Wargrove is 100 pts. without any models.
Heartwood Wargrove (60)
Free Spirits (40)
Your second question is a little more complex. You can use as many battalions as you have points to represent. For instance, if you're using a Heartwood Wargrove and you want to use the Free Spirits and Forest Folk, you can as long as you pay the points for both battalions. You can also use two different wargroves (to represent a larger battle where two wargroves may join forces), but you'd need to pay all the points costs for all the special rules. Also, no matter what you use, if you do not include battleline units in your battalions, you will need to add them in.
Hope that helps.
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