My method: First,you need a software to change them to dvd compatible VOB files. Nero Vision Express can do this,or this program will convert them.(dnload at bottom of page).

Then you can use DVDShrink to cut out what you want(or don't want). Save as vob only and to keep them in order,rename the files to: 001,002,003,etc. You may then use the Nero express prog to rejoin them into one video...

Keep in mind however,that if the VHS tapes were commercial,ripping them is illegal.