Multiple data sets on the same stacked bar chart

I use a board to manage the delivery of design and build of engineering works on a railway maintenance contract

I have 5 milestones and each milestone has a date and cost associated with it. I am trying to summarise cost week by week against all of the milestones but this would mean that the chart needs to have functionality to manage multiple data sets. is this something that is possible and i have missed or has anyone found a work around for this?