
If you're looking for this ability with Watchlists, we have an existing Idea post available here that you may be interested in checking out: https://community.simplifimoney.com/discussion/987/spending-watchlists-should-allow-you-to-enter-a-start-date-so-monthly-averages-are-more-useful#latest
We also have a couple of other Idea posts that cover this ability for different areas of the program --
https://community.simplifimoney.com/discussion/2207/customize-budget-cycle-as-opposed-to-month-to-month/p1?new=1
https://community.simplifimoney.com/discussion/3164/ability-to-customize-the-time-range-on-projected-cash-flow-graph-edited/p1?new=1
If these existing requests don't cover what you're looking for, please specify what specific area of the program you'd like to see this in, and how it differs from the existing requests.
Also, you can bulk select transactions by month on the Web App -- all you'd need to do is collapse all months outside of the month(s) you're selecting, and then check the little checkbox next to "Account" at the top of the register, as this will select all visible transactions. More details on this can be found in our Managing Transactions YouTube video at about 3:45 seconds in.

Please let us know!
-Coach Natalie