English translation: specialised/specialist retail(er) consulting
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Explanation: Is this is title of the department? If so I would suggest something along the lines of Specialized Trade Consulting/Consultancy.
Reference: Hamblock/Wessels is showing "Fachhandel" as "specialized traders/trade"
Beratung = consulting
As Anne mentioned above, it would be helpful to know exactly what kind of trade they are referring to.
Rebecca Holmes United States Local time: 23:17 Native speaker of: English PRO pts in pair: 476