There are two methods you can use to create graphs via the Graph Import.
Method 1 - Using the Parent Graph Field
Add the following columns...
Add Temporary ID column
Add Parent Graph column
Add Parent Graph Operator column
Under Frequency choose Calculated
Add Temporary ID - note, must be a number prefixed with βGβ
Add Operator, such as plus (+), minus (-), multiplication (*), division (/)
Add another row for more graphs
Method 2 - Using the Formula Field
The Formula fields enables you to create more complex formulas and reference other graphs using the Graph ID.
Add Temporary ID column
Add Formula column
Add Temporary IDs
Add Formula using Temporary IDs or existing Graph IDs.