BPP revision kit Q.29 Vogel

Hi, for sample answer part (c), under the “value created from spinning off Department B into Nedge Co”, the PBIT attributable to Department C is deducted from the current share of PBDIT of Department B. Is this because the PBIT attributable to Department C is the profit from intracompany transactions, and hence, it must be eliminated, since profit is only recognized/realized when the profit is from external entities?

Thank you.