How to add two gds files

[connorourke]

If I create a gds file like so:

gfile <- createfn.gds("test1.gds")
add.gdsn(gfile,  input_stuff1_here...)

gfile2 <- createfn.gds("test2.gds")
add.gdsn(gfile2,  input_stuff2_here....)

How do I go about adding the two together so that I have one gds object/file containing both input_stuff and input_stuff_2 i.e. the contents of both files.

Thanks!