I am using Asana for Salesforce to connect the two platforms. When an opportunity is moved to closed-won, I want to create two different projects (different templates) depending on the type of opportunity.

If Field X in the opportunity = A, then the system should create a project in Asana with a template A
If Field X in the opportunity = B, then the system should create a project in Asana with a template B

I want to assign an order number to every opportunity that is moved to 'Closed Won' stage. 

I want to copy certain fields from account object to the opportunity object. I tried adding 'billing address' field in the opportunity object by adding a new custom field with the following formula:
Billing Address (Text) = Account.BillingStreet & ", " & Account.BillingCity &", " &Account.BillingPostalCode &", " &
Account.BillingState &", " &Account.BillingCountry

The system shows the information in the opportunity section in the read only format. I may need to edit this address in the opportunity object. What is the best way to remove the read only status and make the field editable?