[gmx-users] How to generate topology file of cyclodextrin for gromacs?

[jsPARK]

I could downloaded pdb file of alpha cyclodextrin with coordination.
But I have no idea how to generate topology file for that.

Although I found a similar question and answers in the archive, I only could pdb file of only one a-D-glycan.   
https://www.mail-archive.com/gromacs.org_gmx-users@maillist.sys.kth.se/msg36186.html

Could you tell me more specific procedure how to generate topology file from pdb file?