LabVIEW How to eliminate a offset value

In my program I have to read voltage from a electric circuit which is measuring the strain in a object (I know I can read strain directly with DAQ assistant, but the teacher doesn't let me do it). In the beginning, there are no load in the object so the voltage should be zero, but the equipment isn't ideal and there is a offset value. How can I save it to subtract later? I have tried with case structures but it doesn't work.

Here is what I have:

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Solution

Just pass the offset using shift registers.

Here you can read about shift registers: http://www.ni.com/getting-started/labview-basics/shift-registers