Add new expense field to capture claim number

Summary

Our claims department would like to capture claim number on Travel Expenses

Content

As an insurance company, our claims department would like to begin tracking claims number on any travel expenses submitted that relate to travel for a specific claim.  In addition, we will need to report on that field.  Is there a method to add a flex field to our travel expense types for this purpose?  It would not be a required field as all travel is not claims related. 

Version

R13 18C