Answering your first question first to help you out asap:

You probably want to ditch the info shape data and instead use placeholders directly in the shape text. This will allow for more flexibility as you will see in a second. So, step 1: Get rid of the info shape data and put "[Impacted Services]" in your shape text instead.

Next, we want to use the regexreplace to get the first service only. For that we need a regex that matches everything before the first comma and then replaces everything with just that first part. The regex is this: (?<firstService>[^,]+)(,.+)*
Let's analyze it:

• (?<firstService> indicates a named capturing group. We will be able to reuse whatever is captured between the parenthesis in our replace eventually.
• [^,]+ captures anything except for ",". the "+" indicates we want to match this 1 or more times.
• (,.+)* captures ",", followed by any characters 1 or more times (indicated by the +) and THEN allows this to occur any amount of times, including 0.

Eventually, we want to use this regex in our regexreplace, with our input being the impacted services: [regexreplace:(?<firstService>[^,]+)(,.+)*,[Impacted Services],${firstService}] will be our eventual shape text and should be replaced by the result of the entire recursive placeholder text.

If you want more info, I would encourage reading the docs, BUT we also have a brand new Visual Overview course lesson coming up very soon on advanced placeholder usage like this. The regexreplace is also included in that one.

For your second question, think of reusing the entire placeholder text above in your element shape data. It should allow you to link a shape to the service directly that way. (Note: at that point you can just use the "[Name]" as shape text and you can avoid using the entire placeholder twice.)

One final tip: Always simplify your placeholders as much as possible if you have trouble getting the right result. Replace nested placeholders by static text, put the separate parts into separate shapes... It will allow you to identify what part is giving you trouble more quickly.