Room setting

Hello!

Please I want:
1- To add two combo box one number of adults other one number of children in the booking systeme, When user will select number of children and adults rate (price) will change too in the cart.

2- Is there possibility to give each schedule à price of adults and price of children.

3- is it possible to add another field that contain different expression: half pension, All inclusive etc each one have a specific price.

Thank you for any replay