No, it doesn't appear to be possible to do that. The pinouts for the 6363 device and the manual for the 2090a (see pg. 1-5 for dual-connector M-series devices) suggest that you'd need qty 2 of the 2090a BNC connector blocks.
1. The 2090a manual references M-series b/c it probably predates X-series devices like yours. NI has long worked to keep pinouts on their MIO devices compatible wherever possible. That leads to a pretty standardized connector 0 and then whatever extra I/O a given device may have gets assigned to connector 1.
2. Another thing of note is that *ALL* of the 6363's PFI-designated terminals that will be needed for counter I/O are found on connector 0, none on connector 1. I haven't cross-referenced everything carefully, but maybe you can use a new 2090a for connector 0 (2 AO, all counter I/O) while re-using your existing 2110 solely for the other 2 AO?
-Kevin P
CAUTION! New LabVIEW adopters -- it's too late for me, but you *can* save yourself. The new subscription policy for LabVIEW puts NI's hand in your wallet for the rest of your working life. Are you sure you're *that* dedicated to LabVIEW? (Summary of my reasons in this post, part of a voluminous thread of mostly complaints starting here).