How to map CRM's Deal Amount into new Project form's Fixed Cost value

How to map CRM's Deal Amount into new Project form's Fixed Cost value

Hi,

We have a request regarding the integration from Zoho CRM to Zoho Projects (subsequently  inclusive of Zoho Books).
We have setup the integration CRM-Projects in Zoho CRM and mapped Deal Name to the New Project Form.
However how do we map the Deal Amount to the fixed cost value of the form? As we need to map that value when we open a new Project form through Zoho CRM Deal.

Scenario: 
The Deal amount is 4,500, rather then manually entering this in the new project form, can we map the value to Fixed Value (as we are using a template that predefine Billing Method as Fixed Cost for Project every time)


Any help would be greatly appreciated.