Follow the steps below to set up document approval for a specific document in a subsite in SharePoint:

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1. ttGo to the subsite where you want to set up the document approval workflowt
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2. ttSelect the ‘Settings’ tab in the top right hand cornert
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3. ttFrom the Settings dropdown menu, select 'Site Settings't
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4. ttScroll down the Site Settings page and select 'Workflows't
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5. ttClick the 'List Workflow' dropdown menut
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6. ttFrom the Menu, select 'Approval – SharePoint 2010't
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7. ttName your workflow appropriatelyt
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8. ttChoose which list or library should be used for the workflowt
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9. ttSpecify the document you would like to include in the workflowt
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10. ttAssign approvers and the order for approvalt
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11. ttSelect the desired start optiont
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12. ttPublish the workflowt