After uploading a spreadsheet, you can define spreadsheet parameters or tables. You can use the spreadsheet data and logic through these parameters on your CalcTree page.
To define a parameter, open the CalcTree spreadsheet viewer by clicking on your desired spreadsheet on the right-hand side panel.
Once the source viewer is open, select the cell you want to define as a CalcTree parameter. You will see a green button with a white "+" on it. This button will define a spreadsheet parameter which will be listed under the spreadsheet on the integrations panel. The defined spreadsheet parameter will be also inserted on the current cursor position on the CalcTree page.