Download the first page and extract the links:
curl https://access.redhat.com/documentation/en-us/red_hat_process_automation_manager/7.8/ | sed -n 's/.*href="\([^"]*html-single[^"]*\).*/\1/p' | awk '{print "https://access.redhat.com"$1}' > links.txt
Create the mirror site:
wget --mirror --convert-links --adjust-extension --page-requisites --no-parent -i links.txt