How can i take parts of an attachment/file....and create a "sub" file?

Question

I am trying to reduce the size of an attachment/file.  I am wondering how to take parts of one file and create a new (smaller) file?

Answer 1

I think you're using the wrong terminology here.  A "folder" on your computer is a folder, not a file (even though it looks like a file folder like in the real world).  A "file" on your computer is just that, a singular file be it a Word document, picture file, PDF of something, Excel file, whatever.
That said, if you're trying to email a folder to someone, you can't do that.  Email attachments cannot be a folder (i.e. a directory container of multiple files).  To separate different files in different folders, you simply drag whatever file you want into whatever folder you want, but you still won't be able to just email the split up folders because it doesn't work like that.
What you need to do if all the files together are too big to send is to first try to zip them all up.  Find the folder they're in and select all the files by clicking and dragging a selection square around all of them with your mouse.  Once you've done that, right click on one of the selected files making sure you don't accidentally deselect all of them and compress them off the context menu that comes up.  The new zip file that's created will contain all the files you just compressed into it.  You can then email this one singular zip file and the receiver will just uncompress it and see all the files you have in it.  If you have multiple file groups you want to do this with, you can do the same steps for those selections.  There's no right or wrong number of files you can zip together, the gotcha is that if your initial issue was that the email attachments were too big, you'll need to figure out what grouping to do to make everything small enough.  The Word documents will compress the most since it's just text.  The PDFs and picture files the least (if you also have those kinds of files you're dealing with).