Import Record Filtering

How can I place multiple criteria on the import record filtering? I cannot seem to figure out the proper syntax using the expression editor?

Under Expression edit box there is as small toolbar with buttons. If you move the mouse above you will see the hints.

You need to use

|| -> OR
&& -> AND
! -> NOT

Following example will load the records where RECORDTYPE field is equals to
1 or 56
([RECORDTYPE]==1) || ([RECORDTYPE]==56)

We will update documentation to make it more obvious for the user