From FullHD to SD

Hi,
I find myself in the situation where I recorded a video as PAL AVCHD Full HD 1080i 25 (16:9) but have to create a standard DVD-R 4.7GB still PAL Widescreen 16:9 25fps ... I also have to find a quick solution as I have to release a DVD project soon.
Untill few days ago, I was not aware that a regular DVD would reach up to 720x576px
Reading on the Internet I found this article on Adobe but being a Pr Pro forum I do not know if what they suggest can be applied to PrE and also it seems quite complicated to do.
So, I decided to ask the question here as being more appropriate.
[Question 1] I run PrE 11 and wish to know what do I have to do in order to go from FullHD to SD for creating a standard DVD-R 4.7GB still PAL Widescreen 16:9 25fps video.
[Question 2] I wish to know if I can continue working on my existing video project set being set as PAL AVCHD Full HD 1080i 25 (16:9) or if I have to start a new project as PAL Widescreen (which will be 720x576). If so, I wish to know if I can save the portion of the TimeLine of the video still in FullHD (to preserver quality) and than impot it into the new project.
Thinking over this issue I still believe that if a user needs to have the Master video in FullHD, because he/she needs to produce the video in different resolutions or media, it is correct to record in FullHD.
Perhaps where I made the mistake is the type of project I selected in PrE when creating a new one.
[Question 3] But even if I made a mistake in the selection of the adeguate project if I wish to avoid editing the same project with the same edits several times can I still base all my editing on the Master project (set as PAL AVCHD Full HD 16:9) and than export it in FullHD MPEG or even better AVCHD M2T or MP4. Than create a new PAL Widescreen 16:9 25fps project and import the exported video? Will I be able to preserve video quality?
Thank you,
Spiro

Hi,
I appreciate you took your time to reply to me. Indeed I do need proper help and people assisting me. Thanks!
Few concepts I have I have in mind I wish to discuss with you to see where I make mistakes and where I can proceed.
1. If my Master soruce is Full HD for as long as I properly se the PrE project to match the Aspect Ration I can edit the video and than Save it/Share it as FullHD AVCHD M2T or MP4. Do you confirm me this? Which of the two video formatshould I choose from (M2T or MP4)?
1a. I know that my current Master video recording is 9GB in size and here is its native specs. I would assume that PrE when Sharing it as FullHD AVCHD it would be in the same range of MB. I fear that the size of the file could be huge and eat my disc space. Any idea on this?
2. I have been reading on the Internet that there are a lot of software (free and pay) that would convert video from HD to SD. I also read that PrE and PrE Pro do not have a good reputation in converting these videos. Would it be a good idea to first convert the video from HD to SD with a good software and than use this converted video to work on the PAL SD project? This in order to preserve vidoe quality and not get the video distorted in its PAR? Or instead this is not the case and I can safely just add the native or edited but still HD video in my PAL SD project and will not have quality issues?
3. I think of video pixel size the same as for a picture. So, I assume 16:9 FullHD would have the equivalent in a picture of 1920x1080px, correct?
So I go into Photoshop EL and create a new empty image with the size of 1920x1080px. I than draw something inside and save.
Than I go int Image and Resize and make sure Keep proportion" is enable so that when I type either the width or the lenght it automatically presents me with the other value. When I type 720 it gives me 405 rather than 576 as for what I was aiming to.
What is wrong? Why is Photoshop EL does not give me the correct equivalent of a 25fps, interlaced 50Hz DVD resolution of 720x576px? Do I have to look for a specific setting to let Photoshop EL know that I wish to manipulate this file for the video? What is the pixel size for DVD PAL Widescreen 16:9 and for DVD PAL 4:3 (at max DVD resolution)?
I ask question 3 also because I have some very nice and quality pictures that I wish to include in my video PAL Widescreen but their size is way bigger than 720x576 and I was adivsed to resize them with Photoshop EL before adding them to the project. But, I do not know what values to insert when scaling down the picture.
Lastly, as for dpi in Photoshop EL do I have to live 300dpi or can I lower to 72dpi? What is the correct amount of dpi for a DVD video at max resolution?
Thank you,
Spiro

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