There is no easy automated way to "import" layouts from another file, it requires some assembly. However copy and paste can be used to save re-creating everythng. Just be aware that complex layouts with fields and buttons with scripts need some preparation for everything to work as expected.
For instance, if the layout's TO is named "Contacts" in the original file and "Contact" in the new file, then the field objects will be <missing> after they are pasted. Same for the name of the fields: FMP matches the exact names so if they are different there is no match. Similarly buttons will lose their scripts if their names are not correct or they don't exist, so the ORDER that things are moved between the old and new files is important.
Generally the order for copying and pasting is:
Tables and fields
Relationships (TOs for the internal and external tables)
Layouts (just default layouts with the correct names is OK)
Clip manager at www.myfmbutler.com is a wonderful tool that can help with this. I'm one of their customers and i would never leave home without it