New annotations are created by subtracting annotations from annotations on other tiers. This function can be started from> . This will open the Create Annotations From Subtraction window that is based on 4 steps.
Step 1/4: File and Tier Selection ( see Figure 2.103)
Step 2/4: Subtract Computation Criteria
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"
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.
Step 3/4: Destination Tier Name Specification (see Figure 2.106)
Step 4/4: Destination Tier Value Specification
Here you can specify the value for the destination tier.
For detailed explanation on the options see Figure 2.107.
Finally, you can click on. The new tier will be created and populated.