Having relooked at this one I would consider the approach to be if serial no. on label this to be primary no. if no serial the A side T no. as primary and then B side T no. as additional if later serial no. known add as additional cat. no. and on the serial no. labels add the T no.s as additional cat. no.s.
Also when adding additional Cat. No.s add this way e.g. T-1333 / T-1334