Proper way to save to a workbook journal

[zplugger]

I have this master workbook that I save data to a journal,when I open a old workbook that I made from the journal and make a change I loose all my old data. Had a lot of help from here in the last year to make this invoice,just not sure how to fix. I save invoices from the master and might not open that invoive for a couple of months, then I try and save changes back to the master and loose a lot of data. I will post my workbook and will take all suggestions to fix.