I use an older version of Wavelab but the work flow for this probably hasn't changed much (if at all) for later versions
File > New > Audio Montage - select sample rate
Under files tab navigate to files and select multiple files - it will ask you how to add them (un-check the shift existing box, add each file to separate track, etc)
Switch to Clips tab to change the display at the top - this opens up the list for basic editing and is where I add offset for time aligning SBD and AUD files, gain, etc)
I almost always add any plugins to the master buss (compression, de click, EQ)
Click render and select your output format, filename, location, etc.
All done.