ZOHO CRM Product/Invoice Integration & Tax

ZOHO CRM Product/Invoice Integration & Tax

My apologies if this has been answered but I'm trying to set up the Invoice module within ZOHO CRM.

I have setup a product.

1. Is there a way I CAN ONLY USE THE Unit PRICE (Not havethe list price) or for the LIST PRICE field to automatically populate with the UNIT Price?

2. Furthermore if a product is taxable (some of our products are taxable others are not) if the product is listed as taxable can the INVOICE automatically populate this field without clicking the "+" sign. 

I am just trying to reduce the amount of likely errors by our staff when processing payments.

Thank you.