The limitations of LumaFusion are 3 video/audio tracks plus 3 audio only tracks.
I've read your post but I am not clear exactly what you are wanting to do. I have attached a screen shot showing you what I frequently do with titles.
The 2nd track contains a title that has 3 lines of text in it.
I used the scissor tool to create a couple of cuts in that title
I then opened the first two titles and deleted the lines of text that I didn't want.
Then I added a transition dissolve between them.
When I play through the timeline, each line of text will dissolve on, one by one.
The layer on the top is a simple graphic element created in the title editor.
Does any of this help you?
Very close to what i meant.
1) wont the "this is" first title dissapear before "snowy day" will pop?
2)how can i put "this is" in one corner of the screen,and "snowy day" at the other corner with a 5 seconds delay between them?