Creating a large online form from a survey that used to be in an excel spreadsheet

For each Threat entry, I would create a child-table record attached to this parent-entry so that you have a more-reportable set of data which you can filter, group, organize and build summary data from.  My fields would be [Threat #], [Threat], [Timing], [Scope], [Severity], [Impact], [Comments].  Then you can do reporting on individual Threat responses across all your entries.

You could build automations to create each child; or build a formula-text field to compile a dataset that can be used by a single webhook (my preference) that would fire on-save.