LabChart for Windows versions 7.2 and later support recording from multiple PowerLabs and ADInstruments approved devices. The article located HERE, lists the PowerLab models that are compatible with this feature.
To access the settings window for the multiple device feature, left mouse click on the Setup Menu and select the "Devices and Channels..." option from the drop down menu. The settings window pictured below will appear, and you will be to configure the software to record data from all or specific inputs on multiple devices into the desired channels in the LabChart file, set a master timing device, and rename devices.
You can also use this settings window to import channel data from previously recorded LabChart data files with the Playback File Extension and record it into the current file along side real-time data from the PowerLab(s) or other approved device(s).
Please note that this feature is not available for any version of LabChart for Mac.
If you require further assistance with this or any other technical question, please contact ADInstruments Technical Support.