The keyword AND can be used to string together several commands in one. The advantage compared with using pipes is that the file need not be repeatedly parsed and written out, saving time.
To use AND, simply leave off the output specifier (e.g -o) of one command, and the input specifier (e.g filename). For instance:
cpdf -merge in.pdf in2.pdf AND -add-text "Label"
AND -merge in3.pdf -o out.pdf
Merge in.pdf and in2.pdf together, add text to both pages, append in3.pdf and write to out.pdf.
To specify the range for each section, use -range:
cpdf -merge in.pdf in2.pdf AND -range 2-4 -add-text "Label"
AND -merge in3.pdf -o out.pdf