Dear jie yang,
you can use some routine like this:
In your pymol:
fetch 1ATP
create ligand_10A, byres(1ATP within 10 of i. 355)
then you can save the object 'ligand_10A' as a pdb file from the menu: 
file - save molecule
i. 355 is the ligand residue ID

Or if you do not want the ligand to be included:
create ligand_10A_2, byres(i. 355 around 10)

cheers,
Zhijian Xu

jy wrote:
> Hi all,
>
> How can I select all the residues that are within a certain distance, 
> say 10A, around a certain residue or ligand? and once I select that, how 
> can I write out that pdb file?
>
> Thank you very much!
>
> jie yang
>
>
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