Thank you for the response, there are many online tools are to convert gbk ->GFF ->GTF file format. First, I converted genbank file to gff format. https://metacpan.org/pod/distribution/BioPerl/bin/bp_genbank2gff3 After I tried to convert to gff to gtf using following link https://www.reneshbedre.com/blog/gffgtf.html
I got error!!!! Comment on this!