You can have individual milestones created by adding a script line.
Which script can be used to create milestones?
By including the following script line you can have any milestone created:
var wiredminds = wiredminds || ; wiredminds.push(['setTrackParam', 'wm_milestone', '<REACHED_MILESTONE>']);
This script would produce the following result in LeadLab:
Where do I place the script in my website?
You can intigrate the script at any point in your page. In most cases this will be included in the area. Of course, it can also be placed within any events or functions.