How to join series

Hi,

I want to join several series into one new one. All metadata should be stay untouched except series index which is to be rebuilt starting from 1, i. e.

series 1 index 1 - 50
series 2 index 1 - 30
...

should lead to new series with index 1 - 50 - 51 - 80 ...

How can I achieve that?

Best regards

mumdigau