Usually if there is an agg option available it will come up when you start typing, then you add the record as normal. So for example if you have a Marbled Minor agg. to record type in Marbled Minor and the agg will appear. If there are only two options these are sometimes displayed as a one/other, for example Uncertain/Rustic, so it is better to start typing and look for matches rather than type in agg straight away.
There should be these type options for common species that are often recorded as aggs (Grey and Dark Dagger is another that springs to mind), however because records of exact species are more useful some less common aggs might not be available as an option to encourage recorders to try to have the exact species determined.
Usually if there is an agg option available it will come up when you start typing, then you add the record as normal. So for example if you have a Marbled Minor agg. to record type in Marbled Minor and the agg will appear. If there are only two options these are sometimes displayed as a one/other, for example Uncertain/Rustic, so it is better to start typing and look for matches rather than type in agg straight away.
There should be these type options for common species that are often recorded as aggs (Grey and Dark Dagger is another that springs to mind), however because records of exact species are more useful some less common aggs might not be available as an option to encourage recorders to try to have the exact species determined.