We are a travel agency and we use Zoho books for accounting, I have couple of questions related to customising Zoho books for a B2C travel agency,

We do not have any fixed price service or product and all our services like Air tickets, hotels and transfers have different rates for different dates and time. We always have multiple vendors for one customer as we buy air tickets from one vendor, hotels from second vendor, taxi from third vendor and so on.

1. Can I link one customer invoice to these multiple vendors and can have the profit margins for that one particular deal and calculate incentives for the sales executive according to the profit margins?

2. How can we add items/services with variable values?

3. Is there any other cloud based accounting service which is completely customisable for a travel agency also keeping in mind its future integration with a cloud based CRM.  

I will be highly thankful if someone can advise me on the above.

Regards,

Yadwinder Singh