@WebPortal
In one of our replies here Collection with blank field value of Record type we happened to do exactly that. Ironically, we felt upon further checking that it was probably not what that user wanted - however, maybe it happens to be exactly what you may want.
Here is an inline summary of the reply to know which one it is:
~~~~~~
OnVisible Screen 1:
ClearCollect(colBook,{});
ClearCollect(_blankCollectionMock1,{firstname:"somemockvalue"});
Collect(
colBook,
{
Title: txtInput1.Text,
Author: Defaults(_blankCollectionMock1)
}
)
Now this part, say from a Button OnSelect:
UpdateIf(colBook,true,{Author:First(Contacts)})
...........
From next post:
"Upon further testing, our implementation above would only populate the firstname. If that is not what you want, you better do like this instead"...
But maybe this above, is exactly what YOU want where it only has some of the columns - please check and see if something along lines of the above helps in case.