If it is a game in progress, then you shall need to open the savegame and the provinces.csv in the db folder.
Check the province IDs in the province.csv. Then go to the savegame file, look for the State you wish to split (by its name, so, I guess, Virginia). You shall see several parameters, something like:
state = {
name = "Virginia"
colony = no
province = 593
province = 594
province = 589
province = 595
province = 596
province = 1198
province = 1199
province = 1213
factory = { [...snip...]
}
rgo = { [...snip...] }
rgo = {
type = coal_mine
level = 2
id = { type = 4912 id = 4385 }
date = { year = 1838 month = march day = 8 }
pop = { type = 16 id = 43328 }
location = 594
}
[...snip...]
}
You simply take out the relevant province = [tag] and its tied up RGO. Then you either put it into an existing state, or simply write out a new one after or before the one you're modding. In my example, I shall turn Province 594, whatever it is, into a new State, without moving any factories.
In this fashion, you can even merge states if you want within the savegame file. Just do not forget to delete the orphaned entry for the state which you remove from the map.
So, for example:
state = {
name = "Virginia"
colony = no
province = 593
province = 589
province = 595
province = 596
province = 1198
province = 1199
province = 1213
factory = { [...snip...]
}
rgo = { [...snip...] }
[...snip...]
}
state = {
name = "Virginium Novum"
colony = no
province = 594
rgo = {
type = coal_mine
level = 2
id = { type = 4912 id = 4385 }
date = { year = 1838 month = march day = 8 }
pop = { type = 16 id = 43328 }
location = 594
}
}