Please, answer bellow questions

Dear Friends,

Please, answer bellow questions.

1) Is it possible to make copy of any logical database?

2) Is it possible to create custom logical database which contain both HR and SD tables ?

3) Can i delete primary key field from 'Z' table which is now not in use and table contain data?

4) In 'Z' table and standard table i have use Append Structure and Include Structure so at time of upgrade SAP system, which things need to take care and which type of structure need not to maintain again.

Nilay