I generally use “Ctrl + Mouse Wheel”.
See also: Zooming Overview - Audacity Manual
Steve, thanks for your reply. While there are several ways to scroll, it is a much more repetitive process to scroll, then zoom in, zoom in, zoom in, oh, need to now scroll more since my area of interest wasn’t perfectly centered for zooming in, then repeat this time consuming process – versus using the Zoom Tool to select an area of interest and zoom in – no scrolling required! When a segment needs to be copied/cut/pasted into another location in the music (as is often the case), four (4) suitable copy/cut/paste points need to be located. I hope this gives you a better understanding why, in this case, how using the Zoom Tool (F4) is significantly faster and easier than iteratively scrolling and zooming in.
The need to scroll when zooming with the mouse wheel can usually be eliminated by positioning the mouse pointer:
- When zooming in on a selection with “Ctrl + mouse wheel”, keep the mouse pointer inside the selection, and Audacity will keep the selection in view.
- To zoom in on the edge of a selection, place the mouse pointer outside of the selection, on the side that you want to zoom in on.
- If there isn’t a selected region, “Ctrl + Mouse wheel” will zoom centred on the mouse pointer position.
Steve, thanks again for your response. I’m sorry if I wasn’t clear – I indicated in my initial post that I have a segment selected, then use the Zoom Tool. In my simplest Zoom Tool use case:
[1] make a selection
[2] use Zoom Tool (may need to use recursively) to locate copy/cut/paste point
[3] change the start location in the ‘Start and End of Selection’ to merely shift my selection intact
[4] tweak selection/reselect start and end points to sample-level resolution/selection
Of the numerous ways I’ve tried to accomplish this same case with Audacity 3.2.1, the simplest way I’ve found is outlined below. This new process will likely save me some time as I won’t have to ‘tweak’ (i.e., step [4] above) the selection point and will merely re-select exactly the same number of samples. Yes, I’m aware that I could have done this in previous Audacity versions.
[1] make a selection
[2] change the ‘Start and Length Selection’ toolbar to ‘samples’ units (I normally use ‘hh:mm:ss + milliseconds’)
[3] write down the number of samples (enables accurate selection length later)
[3] zoom and scroll as needed to locate and select copy/cut/paste point location – no need to maintain selection
[4] enter the previously recorded number of samples
[5] restore the ‘Start and Length Selection’ toolbar to ‘hh:mm:ss + milliseconds’ units
There’s often more than one way to accomplish the same thing.
What I would do, rather than writing down the number of samples, is to label the selection (“Ctrl + B”) Label Tracks - Audacity Manual
Labels can be moved while retaining the same size by dragging the horizontal bar, and it takes the time selection with it. (see also: Editing, resizing and moving Labels - Audacity Manual)
Steve, thanks for the suggestion. Yes, labels work – I’ve used region labels in the manner you described – I needed to also create a point label so I can then move the region label to it precisely. For a copy and replace operation I’d create a ‘replace start’ point label, then edit the label to make it a ‘replace’ region label with the same number of samples as the copy region. I just need to follow up with some label management when I have too many labels. Thanks again for your responses and suggestions. 
Top tip: you can stretch out your precisely placed point label into a region label.
Just grab ahold (carefully) of one of the chevrons with click and drag - taking care not to click&drag on the circle between the chevrons.
Note that it’s much harder (but no longer impossible - it used to be) to drag a region label back to being a point label.
Peter