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If the texture library contains separate Occlusion, Roughness, and Metallic textures, you can combine them into one ORM texture in a number of ways. Pasting them into the R, G, & B channels, respectively, using an image editor is one such way.
I like to use Blender's compositor to do this.
You can set up your separate image files and use a 'Combine RGB' node to output them to a new render:

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Answer selected by pattersonbl2
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