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I am creating a holiday booking system using SharePoint lists and customised ASP pages. <br />
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I have two lists one that is a list of bookings and another that holds information about the employee such as holiday entitlement etc.<br />
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What I need to achieve is a running total that will take the holiday entitlement minus the booked holidays. Any one any idea how to achieve this<br />
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I am creating a holiday booking system using SharePoint lists and customised ASP pages. 

I have two lists one that is a list of bookings and another that holds information about the employee such as holiday entitlement etc.

What I need to achieve is a running total that will take the holiday entitlement minus the booked holidays. Any one any idea how to achieve this



Holiday booking system and calculating how many days left

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.