It can take a while for final information to come out when a reorganization happens.
This was a taxable transaction.
You received .005371 shares of WAB for each share of GE that you owned.
According to information I just got from GE today, each of those shares had a value of $78.06
So you need to multiply:
$78.06 * .005371 * number of GE shares you had
to get the total value of shares that you received.
Record this as a dividend on 2/26/2019 using the Income button on the Accounting>Investments page.
Then, record a purchase of the WAB shares on 2/26/2019 for the same total amount.
If you received any fractional shares, those will then be sold for the amount of cash in lieu you also would have received. So you will have a sale entry to record that.
When you are done, you need to compare any sale details to a "Realized gain/loss" report you can get from your broker.
If you still own any WAB shares, it is important to compare the cost basis of them in bivio to an "Unrealized gain/loss" report you can also get from your broker.