Updating Parent Titles in Spain

Hopefully a dumb question but does anyone who is currently listing in Spain know how to find and update Parent SKU listings? All reports I run and all pages I view do not show the parent SKU and they cannot be found by typing in the SKU number in FBA inventory? Spanish forums from a few years ago talk about there being a known problem in updating these but there is no new threads on this topic.
I’m trying to update all my listings in Spain as the translations provided by Amazon are way off but if I cant update the parent then there is no point updating the children
Can anyone help?