How to calculate a variable

Good morning!
Please, I would like to know how to use the results of previous questions in order to come up with a new variable. In my specific questionnaire, I am trying to look at different plots of land and, for each one of them, I am asking respondents which crops they grow and how much of each. In the end, I would like to estimate how much of every crop they produce in total (summing up the production of all plots) and then use this number for an additional question. Is there any way I can do that?

Thanks a lot in advance!

Hello Roberto,

yes, you can do that. Refer, e.g. to the “example”:https://designer.mysurvey.solutions/questionnaire/details/04b421596f0443e88cd99ec0538d89ff/chapter/29e3de6dcbdb1d44d647cc2b519671d9/group/29e3de6dcbdb1d44d647cc2b519671d9 in the section “BURGERS” of the public questionnaire “Public example User questions and common patterns”.

Best, Sergiy Radyakin