Proportional movement of several keyframes on the timeline

How can I move a selection of keyframes in a later position. e.g. from 0-500 to 501-1000?? In Bongo 2.0 .Who can help me?
Thanks Thomas

Select the keyframes you want to move. This can easily be done by click and drag on the Timeline.
When you have all the keyframes you want to move selected, right click and choose Moveā€¦ from the list that comes up. Add the amount of ticks you want them to move forward to.

Please note, if you only select one keyframe this option will ask you which tick you want to move to, if you have multiple keyframes selected it will move them forward with as many ticks as you enter.

Thanks; best regards Thomas Bock