How to extract sections with the same heading from multiple documents and merge into new single doc

[edumac]

Hello,

I have multiple documents with class annotations, one for each day. I created one file for each day of class, containing the different classes as different headings, as follows. Each file have its own table of contents:

File 1 - Day 01
Heading - Common Law
Sub heading - british law
Heading - Civil Law


Sub heading - italian law
Heading - Roman Law
Sub heading - justinian law

File 2 - Day 02
Heading - Common Law
Sub heading - british law continued
Heading - Civil Law
Sub heading - french law
Heading - Roman Law
Sub heading - justinian law continued

Now, I would like to create a word document for each subject (Common Law, Roman Law, etc.), that would combine every content of classes in separate word files:

File 01
Heading - Common Law
Sub heading - british law
Sub heading - british law continued

File 02
Heading - Civil Law
Sub heading - italian law
Sub heading - french law

etc

Is there any automated way of doing this? Or will I have do rely on ctrl c + ctrl v?