[lammps -Users] adding epoxy to a single layer graphene sheet

I have made a single layer graphene sheet in VMD and read it by using
read_data command by suitably converting the file into lammps readable
format .The datafile is attached herewith .How can i add epoxy to fill
the simulation box with epoxy above the graphene sheet .Is there any
command or can i do it with VMD and then read it using read_data
command ?
What commands do i need to follow ?

The snapshot of graphene inside the simulation box is attached herewith .
Sumit ,Nagar
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B.E (Production and Ind Engg)
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d1.g (280 KB)