New annotations are created by subtracting annotations from annotations on other tiers. This function can be started from Tier > Create Annotations from Subtraction…. This will open the Create Annotations From Subtraction window that is based on 4 steps.
In this step you can choose the subtraction computation criteria in the Subtract computation criteria window
You can choose one of the following:
Subtraction based on 'exclusive or' logic
If this option
is selected, the subtracts will be computed based on the 'Exclusive-or"
logic.
Subtraction
Selecting this option, will allow you to
select a reference tier from which the annotations of the other selected tiers
will be subtracted from.
Click on the icon to know more about the differences between the above
mentioned options.
Here you can specify the value for the destination tier.
For detailed explanation on the options see Figure 2.109, “Destination Tier Value Specification”.
Finally, you can click on Finish. The new tier will be created and populated.