Paste preserves column assignments of the first dataset.
What it does
This tool merges two datasets side by side. If the first (left) dataset contains column assignments such as chromosome, start, end and strand, these will be preserved. However, if you would like to change column assignments, click the pencil icon in the history item.
a 1 a 2 a 3
20 30 40
Pasting them together will produce:
a 1 20 a 2 30 a 3 40