For your use case there are a lot of ways to do that in Vim without using the multi cursor, here[0] is one thing I just recorded to show you a glimpse of what's possible with just a search and replace: I just find a pattern and replace it with a part of the same pattern.
Again, you can do everything here without using multicursors, just record a macro for one line and repeat with a count and you're set.
Now if you absolutely want the multicursor feature, there are more than one plugin[1][2] for that, but I never felt the urge to use multiple cursors in Vim.
> Here is a good video example (https://youtu.be/iomWEDMBlcE)
Again, you can do everything here without using multicursors, just record a macro for one line and repeat with a count and you're set.
Now if you absolutely want the multicursor feature, there are more than one plugin[1][2] for that, but I never felt the urge to use multiple cursors in Vim.
0: https://youtu.be/YR7rRC-vwj4
1: https://github.com/terryma/vim-multiple-cursors
2: https://github.com/paradigm/vim-multicursor