If there are no Sandbox Templates, create a template first. If one exists, you can skip creating a template. Click "Sandbox Templates"
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Click this button.
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Click the "Selected" field to select all objects.
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Click this button.
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Name the template. Click Save.
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Click "Sandboxes"
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Click this button.
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Click the "Name" field and name the sandbox.
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Locate the Partial Copy type and click next. Note that each customer only gets 1 partial sandbox. If one is taken, you can only create a developer sandbox that has no data.
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Select the Sandbox Template. Give the system a second to load all of the objects.