Grouping items together on MRQ using a method directive

Good Day

Can anyone help me, I am trying to build a BPM which groups certain items and passes them to the unselected to My selections when a user clicks on one of the items. The field I will use to determine this is called the ServiceJobNumber_c

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Basically what I want to happen is if there is Material A and Material B and on the ServiceJobNumber_c it shows the same Job number then I when the user clicks on Part A to move it from the unselected to My Selections then both Part A and Part B move to My Selections

Kind Regards
Rehaan