Asking prices for agricultural produce

Welcome to the community, @omario! You could do the same with different approaches in KoBoToolbox.

Approach 1: Other

You could do it through the other in a mutliple_select question as outlined in our support article User-Specified “Other” Responses for Multiple-Choice Questions. We also have a suitable workaround in the community that should suit you very well:

Approach 2: Matrix Question

The other approach is using the matrix question. This support article Question Matrix Response Type should help you solve your issue. We do have a workaround in the community that should help you: