Pass value of custom field from Opportunity to Quote to Sales Order?

Hello. I’ve googled quite a bit and could for the life of me not figure out how to pass values from

CROpportunity → CR Quote
         I                           I

 Sales Order         Sales Order

I found this code https://stackoverflow.com/questions/36156112/how-to-pass-custom-field-vales-from-opportunity-to-sales-order to copy fields from CR Opportunity to Sales Order but if i try this i get a error message.

'CROpportunity' is an ambiguous reference between 'PX.Objects.CR.CROpportunity' and 'PX.Objects.CR.Standalone.CROpportunity'

I'm not sure if this code is functional for my needs. We added several fields on a new Tab in the Opportunity screen that we would need to transfer.

Although I've successfully created a method to transfer fields from Sales Order to Shipment and Invoice, I haven't been able to locate any code examples for the task at hand.