I want to pre match a candidate to a group of shift(s) that I am converting from Rotageek, can I do this all together as a group when I convert them?

At the moment there is no way to pre-match a candidate to the shift before it has been converted from Rotageek to Locums Nest. Therefore once the shift has converted to Locums Nest, you will need to navigate to that shift on Locums Nest and pre-match the candidate in the normal manner. Unfortunately there is no way to do this as a bulk pre-match, only in each individual shift.