Managers (contacts, full name, contracts / Legal entities)

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Products (articles, prices, availability, characteristics, price types/price matrices, photos)

Legal entities (name, contact information, details)
Document flow (invoices, receivables)
Optimal option:

Products (articles, prices, availability, romania consumer email list characteristics, price types/price matrices, photographs, analog database, related products)
Counterparties (name, details, contacts, agreements)
Managers (contacts, full name, contracts / Legal entities)
Legal entities (name, contact information, details)
Warehouses (link with product range, link with regions/retail outlets)
Document flow (invoices, receivables, reconciliations, acts, transport documents)
Claims (information on returns, claim statuses)
Useful lifehack. I advise you to first choose a contractor and only then, with his participation, put the accounting and warehouse system in order. This way you will save time and properly prepare for the launch of the platform.

2. Data centralization
Before launching a trading platform, centralize information on prices, product availability, contractors, and branches. All this data should be aggregated in a common database on a central server. It is bad if you do not have established data exchange with branches, in this case, connecting them to the platform will be labor-intensive.