I think you mean " get/obtain his approval". But what does "that" refer to? It's natural to interpret "before that" as meaning something like "before we go ahead" or "before we proceed", in which case "...
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Wonder123How about this sentence, please help me.Wait! We first have to meet the head of the department, take his approval and then we can/should proceed.We first have to meet the head of the department and get his approval, and then we can/should proceed.