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NEEDED_How to implement this function

Question asked by cyccyc621 on Dec 29, 2015
Latest reply on Dec 29, 2015 by cyccyc621

Hi, Dear all,

I started my rental system with In records and Out records posted below:

1.jpeg

 

 

Now, I want to implement a function:

2.jpeg

I don't know how to realize it. Or I'm in a totally wrong way. Should I break it into tow portals for each kind of records, and then do a calculation?

I need help. Thanks you!

 

Best regards,

Cyc

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