Reference
The Expansion Inventory
Everything you already have that an existing customer could buy next, written down with what each item is worth. Most companies have never made this list.
What it is not
Not a product catalogue.
Where it was staked
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Beyond what they bought first, could you list everything your customers could buy from you, or through you? Almost nobody has ever taken the inventory. An empty one is a design choice, and it's reversible starting with the next contract.