Migrate from standalone infoblox to existing grid

[#1]

We are looking to migrate a database from a standalone infoblox and merge it with our existing grid. 

What would be the best way to  accomplish this? 

[#2]

Depends on the size of the existing database.

Just out of question:

Why do you have a standalone outside of the grid? 

I would expect you'd need to export all IPAM,DHCP and DNS data and import into the Grid.

Is there much on the standalone?

[#3]

It was initially configured that way, trying to fix it. 

Exisiting database is not that big, tried importing using CSV import but received error on almost every line. 

Any other option to be able to accomplish this?