Thank you Bastien. As you said, I would like to reduce the redundancy of those three genomes. At the same time I should choose only one genome among the three. By choosing one genome, I should not miss any regions/gene of the omitted genome aswell. That is why I though to merge those three genome into single one. However I would try the vg tool as you suggested.
I have annotated all the genome by Prokka only. I do not understand, how does prokka help in this regard?
do you want to create a pan-genome using these three draft genomes?
No Ashish, I have 30 bacterial genomes including above mentioned three genomes. But, as per pan genome analysis If i include those three genome, I may end up with less unique gene numbers, because of accessory genes sharing among those three genomes. That is why, I would like to combine those three genomes into one. So that I will be having 28 genomes for my pan genome analysis. Thus would help me to find more unique gene.