Abaqus - Sub structuring in abaqus CAE

Hi all,

I am doing a contact, geometric non linear analysis of transmission parts (case , housing, cover etc...). Here i want to check the contact opening between case and housing parts.

Housing and CASE are connected through bolts and COUPKIN...

I want to use substructuring technique for this analsysis in abaqus cae.

Can anyone tell me the exact procedure to do the sub structuring? 

Abaqus ​​​​​​​