In the previous versions, copying from a few colons and pasting to one single colon would nicely arrange the data as follow :
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
if all selected from the 5 colons, when pasted into one colon, it would come as :
1
2
3
4
5
6
7
8
9
10
11
...

This doesn't work anymore using Origin 6.
Now it creates as many colon as needed, and it is not possible to paste many colons into a single one.

I presume I 'll have to write a labtalk for this... I confess I find it terribly irritating when things are changed without leaving the possibility to keep "as it was ". It reminds me of another big software distributer. starts with a m.

Could you help me for this please as I'm not a labtalk person at all...

I was surprised by this as well...I was not aware of the Origin 5.0 behavior and I am pretty sure it was undocumented. The change in behavior may be a side effect or maybe I just never heard of it. Anyhow, In Origin 6.0, convert the worksheet to a matrix (select the Origin Edit:Convert to Matrix : Direct menu item) and then copy/paste the desired data from the matrix to the worksheet column (matrices are stored internally as one dataset). This should do it for you.