There is no need to use the import manager, You can simply do this by the following steps :-
1.Open the editor
2.Go to file > preferences
3.Tick the box saying Automatically create unknown variables while passing trigger data.
4.Open the map in which the spells are.
5.Open the trigger editor.
6.Copy the category of spells / Or the triggers of the spells... whatever just copy any thing on the left pane or click on file then export trigger data.
7. only export the trigger data if you have no progess on the map in which u are going to use the spells otherwise just the copy the category/trigger
8.Open your own map.
9.If you have exported the trigger data and you have done no progress in terms of triggering then just import the triggers.
10.If you already have some triggers then (not the default) then paste the copied trigger/category.
11.If the spell uses some units like a dummy or something like that then you have to copy the object data (the unit) from the Object editor of the spell's original map and paste them into your own map.
If you are still having problems then pass me the maps and I will do it for you.