This isn't the intended use, but it is possible to do. Only the iD44 has a standalone mode, so you will need to use the iD14 as the interface connected to the computer though.
It is worth mentioning that the downside of this setup is that you will need to plug the iD44 in a computer every time you wish to change the sample rate.
The way you would do the setup is:
1) Connect just the iD44 to a computer and open the iD Mixer application
2) In the System Panel under Routing, select Digital Outputs 1-8 and route outputs 9+10 to Cue A and 11+12 to Cue B.
3) Make sure the Preferred Clock Source is set to Internal, and Digital In and Digital Out are set to ADAT.
4) Go to Cue A in the Mixer, turn Mic 1 and Mic 2 up to 0 (alt + click on the fader) and pan them left and right. Make sure Cue Master is all the way up.
5) Go to Cue B in the Mixer, turn Mic 3 and Mic 4 up to 0 (alt + click on the fader) and pan them left and right. Make sure Cue Master is all the way up.
6) Click on Setup in the menu at the top left of your screen and choose Store Standalone State.
7) Disconnect the iD44 from the computer and run it only on the 12V power adapter. Connect Optical Out 1 of the iD44 to the Optical In of the iD14.
8) Connect just the iD14 to the computer and open the iD Mixer application.
9) In the System Panel, make sure the Preferred Clock Source is set to Dig 1, and Digital In and Digital Out are set to ADAT.
Now you are all set, the four analogue inputs of the iD44 will come up under the first four digital inputs of the iD14 and you will be able to record them in your DAW, along with the two analogue inputs of the iD14.