Tool to split data in half into different outputs

[tf05]

I am looking to split my input in half, assign each half a reference and combine combine it back together?

Does a tool exist to split the data into two output

Input:

A

B

C

D

Split into separate outputs:

A   

B

C

D

Add Reference:

A 1

B 2

C 3

D4

Combine:

A 1

B 2

C 3

D 4

Thanks

[binuacs · Accepted solution]

@tf05