We can't really tell you how to do that: it depends far too much on factors that we have no ideas about.
For example, if your DGV is bound to a DataSource (such as a List or DataTable) then you need to modify the datasource to split the data. Conversely, if you add the data manually to teh table, you need to split the string (which is trivial: String.Split Method (System) | Microsoft Docs
]) and then ensure there are sufficient columns in your DGV to hold each of the values.
And we can't tell you "do this and it'll work" as a result - there are far, far too many variables involved and we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with.
So start by looking at your data and where it comes from, and go from there. This shouldn't be difficult with just a little thinking!