Hello @Mercy_Udele
Copying LBF content is a very tricky process.
The problem is that the different parts of an LBF are stored in different places in the database. The only way to know what parts belong in which forms is that each component has a reference identifier to the form or frame it belongs in. For example, one table in the database has a list of the names of all the LBF forms in the system. Another table has a list of all the control objects (buttons, text areas, etc) in all the LBFs, with an identifier for the LBF that each one is in, and where it is in it.
If one wishes to transfer one field of an LBF, it would require manually tracing all the field’s desired components, backwards from the table of objects through the table of LBF forms, then duplicating them and re-naming them for the new form they would appear in.
Yeah, right! 
You might want to refer to this (old) article to see some of the complexities involved in simply copying an LBF, without also separating out the fields:
This is all to say that it ends up being a lot less work to simply re-code the field in a new form.
Best- Harley