Adding field to Line Transaction Flex field

Hi,

We have a requirement to add a field to Line Transaction Flex field, so an additional field interfaces from OKS to AR.

I can add the field by Navigating to the Line Transaction Flexfield

Sysadmin>> Applications>> Flexfields>> Descriptive >> Segments

Query Line Transaction Flexfield

Go to the Context value CONTRACTS and click on Segments

Add Segment 11 (INTERFACE_LINE_ATTRIBUTE11)

My question is how to map this field? Is this a configuration or requires code?

Thank you,

Anu