Converting boots w/ multiple parts from HDT to NIO?

[Mookeylama]

been changing boots over from hdt to nio, but occasionally i come across a boot w/ multiple parts, like upper leggings, cuffs, greaves, spurs ect. do i need to add the SDTA niextrastringdata line to all those parts, or just the lower foot, boot part? thnx

[StaticPhobia2]

Just one. I always do it to whatever is below the heel.