javascript acrobat

Another way could be to export the PDF you want information from, as a FDF file, then import the FDF file into the PDF you want to insert the information to. There is a programmable way of doing this, if needed.

You could open both forms in Acrobat and then use the "Prepare Form" tool on each PDF to edit the forms by cutting and copying the fields between the 2 forms. Or  you could use the "Organize Pages" tool to merge the 2 forms into one form, then use the "Prepare Form" tool to move the form fields as needed and delete the unwanted form fields and unwanted pages. Note that the second method will copy over all document level scripts that may need to adjusted.

You posted in the JavaScript forum. Does that mean you want to do it with a script? If so, the easiest way is to use the Replace Pages command, as copying the fields directly is not possible. Alternatively you can collect their properties from the source document to a global variable and then recreate them in the target document. Doing so will remove all Actions and other settings like Format, Validate, Calculate, etc., though.

Select the fields and copy and paste.