Is it possible to automatically roll-up values in the software. i know you can do it using calculations but I saw something on some release notes that said this can be done automatically
Yes you can. You probably saw the advice on the Spider Strategies blog. Rather than copy the instructions here, go and take a look at: http://www.spiderstrategies.com/blog/2016-08-25-aggregate-metrics-accross-orgs.html
Just be aware, and it doesn’t say this in the instructions, the roll-up function ONLY applyies to Organisations that have been Linked using the Link To option when creating the tree.