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I would use the Formula tool. Place it after your Input Data tool, then from the drop-down in the Formula tool's configuration select "+ Add Column" and type the name for your new column. For the expression, use a formula to add them together:
Make sure to choose an appropriate Data type (i.e. Int16/32/64, Float, Double, etc) so you can use it later in your flow.
why you don't want to use transpose? I think you want to see your sumed field along with other 100 fields, for that you can use join tool and achieve the desire result. i am attaching the solved workflow. See if it helps.(As an example I am taking 20 fields, you can do this same on any number of fields)