[galaxy-user] flaking regions across TSS

I am interested in getting regions flanking TSS, I am using Glaxaxy and have downloaded TSS sites using this post steps https://lists.soe.ucsc.edu/pipermail/genome/2011-June/026175.html Now what I would like to do is to get 5000 bp upstream an downstream using flank tool in galaxy, but i realize it only gave me option for gene start or whole gene. Is it possible to extract 5000 bp upstream and downstream regions across tss start site . Once I have that then I want to find non overlaping genes in my regions from chipseq data. Thanks Kanwar