I'm not understanding the logic of a bubble chart. I have to show schedule variance vs budget variance. With the size of the bubble correlating with the budget. I have to have a way for users to see dates other than today and the colour of the chart is based on the region.
Regardless if the bubble chart is appropriate or not in your specific situation: Bubble chart is just a scatter chart with three expressions. The first two expresions define the position of the data point, and the 3rd expression is the bubble size. And, make sure to choose one of the scatter type styles that support bubbles. There are 8 types for the scatter chart, only three are "bubble-compliant".
I'm am just new to QV as of yesterday, so please bear with me. When you say the 3rd experssion is the bubble size - what does that mean? And what would that look like? So the first two expressions would be - at least in my case - sum(schedule_variance) and sum(budget_variance)? And the dimension would be the managing office?