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Unfortunately, even adding a small thing would involve opening the SKP file, make your modeling changes, OBJexport it - pretty much all the steps needed as if you are building an entire stadium from the ground up (just faster because the "modeling" portion is only adding bullpen on top of an existing structure).
Also, depending how a particular ballpark was built, either you can simply change a texture, or you have to add new geometry with sketchup tools. I always recommend to see Silvam's tutorial videos and just practice with a simple ballpark from start to finish. Most 3D modders here learned that way.
There is no easy way. You got to understand the whole process. Otherwise, certain things may not work and you wouldn't be able to figure out why.
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