Multi level/hierarchical category axis chart

Appian doesn't support the layout as you've presented it. With a little thought you can achieve the same end. Options off the top of my head:

1. simply concatenate the labels on the chart as it is currently laid out e.g. 'Diagnostics/Other', 'Diagnostics/Pre-Anesthetic'
2. you could implement selectable drop-down or a drillable chart - where Level 1 of the chart shows the categories:  'Exams', 'Surgery', Vaccines' etc and by selecting/clicking on one of those top-level categories you reveal a second chart that shows the sub-categories

Appian doesn't support the layout as you've presented it. With a little thought you can achieve the same end. Options off the top of my head:

1. simply concatenate the labels on the chart as it is currently laid out e.g. 'Diagnostics/Other', 'Diagnostics/Pre-Anesthetic'
2. you could implement selectable drop-down or a drillable chart - where Level 1 of the chart shows the categories:  'Exams', 'Surgery', Vaccines' etc and by selecting/clicking on one of those top-level categories you reveal a second chart that shows the sub-categories