Hi all.. Is there any way to create data type (CDT) dynamically in the bac

You can create named CDTs (CDTs that show up on the Data Management page) by
1) Creating them with the Data Type designer in the designer interface
2) Importing an XSD
3) Deploying a custom plugin that defines a custom data type
4) Publishing a process model that calls a SOAP web service that defines CDTs on its WSDL

You can create ad-hoc data structures using dictionary syntax in expression rules, but these will only be accessible at run-time - you won't have access to them as named types on the Data Management page or in process models.

You can create named CDTs (CDTs that show up on the Data Management page) by
1) Creating them with the Data Type designer in the designer interface
2) Importing an XSD
3) Deploying a custom plugin that defines a custom data type
4) Publishing a process model that calls a SOAP web service that defines CDTs on its WSDL

You can create ad-hoc data structures using dictionary syntax in expression rules, but these will only be accessible at run-time - you won't have access to them as named types on the Data Management page or in process models.