Convert 50p to 25p without speed change

Hi there,
I have got a bit of a complex shoot coming up, so was looking for some advice please.
I am filming a one-shot video. There are a few sections which slow down to half speed and a few that go to double. I am filming it at 50p, so when I edit, I can halve the speed to get a nice slo mo at 25p is great for some moments and then have some of it running at 'real time' and then double the speed for the other parts.
The issue is that I don't want the other two sections (the 'real time' and double speed) to be at 50p and 100p respectively. Is there any way I can convert those sections to 25p, so it all ends up at 25p?
Thanks!

Thanks for the reply!
Two questions though- I read that when I convert 50p to 25p (either by starting a new timeline set at 25p, or by first importing a 25p clip...all good with that bit), that the effect can be quite jumpy. Is there any way to avert this? I read about Cinema Tools, and have been told that is the best option? Wanted to get some others thoughts on this.
I hope I can explain this next bit well- as it is a one shot video, I will import the whole take into the timeline, make a few cuts with the blade and double/half sections as needs be. Do I want to convert the whole thing to 25p before I do that though? As I will lose the option to half the speed.....

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https://discussions.apple.com/message/17326652#17326652
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interlaced is easier for action-packed motifs.
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Convert 50p to 25p without speed change

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