Hi Julia,
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Please take a look at the below link.
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http://en.community.dell.com/techcenter/sharepoint-for-all/f/4782/t/19552818#5920
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It talks about custom actions using custom code.
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The idea for you is to use our sample solution (check your QWP installation folder, "Sample Code" folder) and adapt that code to your requirements). You need a bit of code added to the Form Initialization Action feature that would populate the field Status based on the value of the field Completed Data.
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Our sample solution is well commented and our help file (see Custom Action Help topic).
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If you have any questions please let me know.
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