Message mapping - Map 2 source contexts into one target context

Hi,

I have an issue as follows:

Source context 1 (defined as 1.....unbounded)

Source context 2 (defined as 1.....unbounded)

Target context 1 (defined as 1.....unbounded)

I need to map both source contexts into the single target contexts.

For example....

Source context 1 has 3 entries

Source context 2 has 2 entries

Target context would have 5 entries in total (Source context 1 and Source context 2)

I have only limited knowledge of working with multiple contexts so need a bit of advice.

Can someone provide an easy way to do this ? I'm sure there is.

Cheers

Colin.