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Explanation: A text like this, you can't go word by word, I think.
"Il progetto preliminare d'immagine sarà A cura di XX, mentre YY fornirà il supporto al progetto preliminare."
XX will take care of/will carry out the aspects regarding/concerning the image of the preliminary design (draft?), while/whereas YY will/shall provide/contribute the necessary support to the project/will support the project itself...
Something along these lines could be good.
Still, I think it's not that clear, maybe though, you have more context otherwise, in case you really can't make any sense of it, I suggest contacting your client.
darwilliam China Local time: 13:28 Native speaker of: English, Italian