I just wanted to post an update, since this is the first payroll I was trying to do with having two states on one employee.  I found that not only would I have to change the state worked and the state withholding to the other state and change all the allowances and extra withholding, but when I do the check I had to make sure I changed the class to Kansas and check the box to Do Not Accrue sick/vac or it would double it up, and also had to wipe out all Other Payroll Items or their medical deductions would double up. Then, when I was done, I would have to go back into this employee file and change all the State withholding info BACK TO THE ORIGINAL...   This is asinine and I could see mistakes being made and was going to create tons of extra work changing things back and forth....  It was not just as simple as changing the employee back and forth between Missouri and Kansas.  I am paying for Assisted Payroll and MOST OF THE WORK should be being done for me, NOT just the tax tables, but this was going to create SO much extra work...

SOOOO I tried something and it worked. I opened up the secondary (Kansas) employee file, clicked the box on the lower left that says Employee Is Inactive, then I changed all the fake social security numbers back to the real number, then when I clicked SAVE, it now is back to giving me the warning that I already have an employee with this number, am I sure I want to save and I click YES and it saves. Then I went to the top of the Employees list, click on the drop down box and clicked All Employees, found the employee I just inactivated, clicked on the X to the left of their name and it reactivated it. 

As I said, this only becomes an issue when you need to change an employee's rate of pay or their medical deductions, address or phone number, new W4 info, or anything else they need changed...  I checked with Missouri and they said there is NO STATE COMPLIANCE that requires both Kansas and Missouri to be listed on one W2, because when you create a State CSV W2 file to upload, it asks you at the time WHICH STATE you want to do!!!  You CAN ONLY CHOOSE ONE STATE!!!  And Kansas Doesn't allow uploading files, so I have to just choose Missouri...  Someone at QB didn't think this thru before they made this change...  As I said, I've used Quickbooks since 1996 and THEY are the ones who told me I had to create two separate employee files, one for each state, and I've done it this way for 27 years!!!

So basically, in a nutshell, if you need to make a change to one employee file, just inactivate the other one, make the change, then go to the other one, make the change, then reactivate them both...