Adding files to separate targets in Xcode 4

Solution 1:

Select the project file in the document explorer. On the Right margin of the Xcode window make sure to display the right drawer view if it isn't already there (it usually has Object library and Quick Help). In the top margin, click on the icon that looks like a document (rather than the one with the waves that is quick help). The target membership and the other info from the old Get Info command is there.

Solution 2:

Select the project file in the document explorer pane, select your target from the list, select the build phases tab and add/remove your resources in the copy bundle resources phase or source code in the compile sources phase.