Testpad has always let you insert bug numbers against results. Typically these come from a 3rd party issue tracking tool such as Jira or Bugzilla. Further, these numbers can be a clickable link to the relevant page in the 3rd party tool if the bug-link pattern has been configured (either in project settings or account settings).
But in an update today, Testpad now lets you enter more than one bug number against one result. Simply separate numbers with a space and Testpad will treat them as separate issues when generating links in both the script-edit view and the various report views.
There isn't much space for more than a couple of numbers to be seen in the script-edit view, so the printable report has been extended to list all the issues against results, again as clickable links, in the comments section.