Is it possible to split multiple source lines at one time?

Hi, I am wondering whether it is possible to perform mass split/split multiple source lines in one time?

For instance, there were 2 source lines, Source line A with 10 units and Source line B with 5 units. Can I split these 2 source lines into 1 unit each at the same time without having to do it one at a time? I have tried to perform this, however when I multi select the source lines, the split button does not show (unable to click).

Hence, I would like to know if there are any features, template or workaround that allow me to perform this activity?