How to add this field in search - Original System Reference for Customer Account

Summary:

Content (required):

client has a requirement that they need to search with OSR number in manage customer page,but I am unable to find the field name in ADD field,

Can anyone suggest me where we can add Original System Reference for Customer Account name in ADD FIELD so that it populates in the search window.

I am able to see Original System Reference for party but not Original System Reference for Customer Account.

Need to add Original System Reference for Customer Account.

Version (include the version you are using, if applicable):

23c

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