Go into your smart list ( or static) and click the Leads Tab > Select ALL > Lead Actions > Marketing > Change Data Value
here you have the options! So click ADD choice...
Select " IF "Company Name Field" IS (select all the variations ( or type them in on each line)) Then attribute "company" to Change all the variations to (new Value)
I wouldent worry about the rest as it will do nothing if it dosnt match your Search Criteria.
I use this with State Variations like Mi, Michigan, Mich. To a standard value :)
Side Note: If you sort by Assending you can just highlight the ones you want to effect ( ctrl shift will let you select everything between 2 leads; typicly they're all grouped togeather) and then juust click > Lead actions > Marketing > change data Value > and pick the field you want to effect and enter the new value. this will change only those leads and you dont have to go though the "if maching" filter. But either way will do what you want it to :)
Hope this helps!
You're Welcome :)