From what source are you exporting that CSV file?
Perhaps there is a different file format that will support the import of styled text.
Otherwise a script or auto-enter calculation may be need to reformat the data after import if portions of the text are formatted differently from the rest of the data in the same field or for what you need in this field in other records.
In cases where the entire field contents need a particular format and the same format for all records, you can just specify this format as part of the layout design.
I'm generating the file myself. I can generate any format. I would like to know what format would preserve the style information and will generate that instead.
Also, I thought that I might be able to fix the fields later using a FMP script, but I didn't see a script option that would take a word an make it italic. I haven't done much scripting in FMP so I might have missed it.
I'm not sure that you can include the formatting, but you might try producing styled text in an Excel file--which is a file format that FileMaker can import.
What you are looking for is a function that you can use in a calculation. And there are text formatting functions that you can use in a calculation defined in the calculation portion of Replace Field contents or Set field that can take the current text and apply text formatting to it.
If you search FileMaker help for "text formatting functions", you should be able to pull up a list of the functions that are there. You may also find that the Text functions--which can be used to parse portions of text from a text field, to be useful as well.