How can we create different type of variables for terms template?

Summary:

How can we create different Variables for terms template?

Content (please ensure you mask any confidential information):

Below are some example i want to populate in contract terms linked with Purchase Order.

•	Date of Contract (PO Open Date)
•	Vendor DBA (Supplier Alternate name)
•	Taxpayer ID(Supplier)
•	Scope Description (PO Header Description)
•	Contract Extended (PO amount in words)
•	Owner's Rep (Project manager)
•	Additionally Insured (Insurance details of property)

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Code Snippet (add any code snippets that support your topic, if applicable):