Scene time change from 10s and cutting frames from shots on timeline

Not managing to find how I change the time length of the scene to more than 10 secs. Appreciate help. Also can the timeline be trimmed between shots, so if I have done a camera cut from A to B but I actually want to lose some frames from the end of the A camera shot or from the beginning of the B camera shot can I do that, like blading through in two places and removing the frames between?