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If a non-standard set of questions was used to generate the data, then you will need to supply the questions as well. In order to import the assessment data, first a question set (both questions and categories) needs to be created, along with all requisite objects like answer choices and answer response groups. If the questions along with their requisites are already loaded into your instance of Isora GRC, you should indicate that when you open the support ticket.
Usually, people want to import previously completed vendor surveys, but it is also possible to import app or org unit surveys. These may have been generated using Isora GRC in the past or another assessment tool.