If you want a single table, then you can have the first column hard-coded and use separate formula for each cell. For example,
| Group | Amount | % |
| ="Food Sales" | =[Amount] Where ([Group]="Food Sales") | =[Amount] Where ([Group]="Food Sales")/[Amount] Where ([Group] InList("Liquor Sales";"Food Sales")) |
| ="Liquor Sales" | =[Amount] Where ([Group]="Liquor Sales") | =[Amount] Where ([Group]="Liquor Sales")/[Amount] Where ([Group] InList("Liquor Sales";"Food Sales")) |
| =" Total Sales" | =[Amount] Where ([Group] InList("Liquor Sales";"Food Sales")) | =[Amount] Where ([Group] InList("Liquor Sales";"Food Sales"))/[Amount] Where ([Group] InList("Liquor Sales";"Food Sales")) |