It's not a sublabel like others and it seems somewhat 'hidden', but Scantraxx definitely own or have some share of Italian Hardstyle.
Check the sidebar of
The R3belz' Soundcloud, it's referred to as the "Scantraxx-Italian Hardstyle Group" implying that there's a business connection between the two. Plus, those
scandalous chat logs between Bioweapon/Audiofreq Sam and Nikkita mention that Dov (Elkabas, The Prophet) wants to "keep gerardo [Roschini, Zatox] to make money off of him," implying that there's, again, a relationship between the two labels. There was also a slip-up on some download portals in 2010 where an Italian Hardstyle release (can't remember which but the image is still probably around) was released under Scantraxx Italy. Could've been a clerical error but the stores just report what you give them, so that's a little more 'evidence'. There's one other link which I'm really tentative to make since it requires a bit of jump in logic; last year for the Hard Dance Awards two labels released samplers containing tracks to try and get the fans to vote for them: Scantraxx and Italian Hardstyle. Not to mention that the artworks were very similar. It's not concrete whatsoever but you can definitely see the connections.