Adding image on condition

[#1]

Hi,

I have a straight table with four dimension.One Audit_Desc,Sub_Audit,Count,City.

I have added condition to the Sub_Audit dimension.which will show in the chart for few Audit_Desc.

I want to add an expand image in Audit_Desc for which there is Sub_Audit value.Kind of dropdown in Excel.

Thanks in advance.