Create several virtual copies at once. Looking for a workflow of exporting 650 photo's in two versions

Question

Hello,
i have photographed a wedding and i have 650 finished photo's. All came from a 5Dm3 of 5Dm2. All are in raw. The color versions are ready. I have created a preset to convert all 650 edited version to B/W. The key is i will not edit the curve and other light and contrast sliders because, and cropping for that sense since these are all done already. So to make it more simple, i need to silver 650 photo;s in color and B/W. The color versions are done.
I am looking at three workflows:
1 create virtual copies of the 650 photo's, filter them out, apply the b/w preset/ make some small tweakes and export the B/W version
2 export the color version to a 16 bit tiff, import those and the apply the b/w preset/ make some small tweakes and export the B/W version
3 make an extra copy of the lightroom library and then apply the b/w preset/ make some small tweakes and export the B/W version
In option one i do not know how to create 650 virtual copies at once. It seems i can do this only one photo at a time which is to time consuming
In option 2 this is an extra batch and consuming me much more hard disk space
in option three this is workable but i rather stick to one library
Any help in this?
Thanks!!
Ronald

Answer 1

Go to the library module, grid view. Highlight all your images and create a new collection. One of the options when you create the new collection is to make new virtual copies. The collection will consist of virtual copies of all your original files. Then, just work with the collection and create your black-and-white images. The virtual copies can be exported just like the regular images. So you can export color and black-and-white versions.