Are the following sentences natural to a native ear?
1. Please see attached our latest publication.
2. Under which item should these expenses be shown?
3. Under which category are these items listed on the statement?
NOT A TEACHER
Numbers 2 and 3 are fine in UK English, but I would suggest changing number 1 to:
Please find attached our latest publication.
Use this if you are literally going to attach the publication to the letter you are writing with a paperclip or staple. If you are sending the letter with a publication that isn't or can't be physically attached, use:
Please find enclosed our latest publication.