Many thanks both to Borate and Nationalsolo.
1. Transition Duration playback doesn't change.
I need to take my issues a step at a time so as not to confuse matters. So may I address the specific that the play back duration of the transition does not appear to change whatever duration is selected. Yes, the grey band can be stretched as required as an alternative to selecting a duration BUT the play back duration doesn't change. Here is a link to a video taken with Debut that shows exactly what I did. I should point out that in this sequence there are fade transitions that have come in with the original video made with Debut that was in turn made from a Power Point slide show some time ago. In the video clip, I remove that fade transition before moving on to apply the Diamond selection.
https://drive.google.com/drive/folders/1gJetOvDvZL2aTrWiqII6oxBoSA9Ogw03?usp=sharing
I click frame by frame through the transition and in both cases it lasts approx 20 frames. What am I doing wrong? Borate asks what version i am using - it is VP Professional 8.67
2. Removal of the original videoed transitions from Power Point:
Thank you again Borate for the "L" ket quick method of applying splits. For my 110 slides I might have to do two splits followed by delete for each unwanted trasition (as shown in my video clip). Any suggestions for a quick way to do this? I wondered if there is a clever means to, following a split. to delete a fixed length of the right side clip since all the old transitions are the same?
Further comment:
I said that the duration of play of a transition was not affected by the grey band length. However I found that the transition choices that require additional information such as "Blinds" DO respond to the duration selected whilst those such as Diamond DO NOT!!
Thank you both for all your help.