Migration of Rules from BRMS to SAP Build Process Automation Manage Rules Project or Decision

[gaurang_gujar]

Hi All,

I am looking for best practise for migration of rules from BRMS to SAP BPA .

As I see there are couple of options  

a. Decision b. Manage Rule Projects

Here are the scenarios and which tools should be the best practise ?

1.  We have few  projects which are SAP IRPA we are migrating to BPA . IRPA projects called BRMS via API . What would be a better approach here to import BRMS rules into MRP and use the API call to invoke the rules or convert the rules to decision or restructure and design the whole automation in order to use decisions ?
2. In case there are CAPM or other application which are consuming BRMS via API what would be a better approach Decision or Manage Rule Project

Few generic questions 

1. Rules in Manage rule projects can be transported across tenant via CTMS
2. How do we achieve maintainability of decision in production tenant
3. In case of Manage Rule Project we see + ( Create Rule) button is disabled so incase if new rule need to be added how can we achieve the same ?

Also best practise document or link for Manage Rule Projects and Decision will be helpful.

Please guide.

Regards,

Gaurang