There is an update available to 5.1 in my dashboard. Can I update the website without disturbing anything? I've never done an update before...

There is one more thing I saw which may be of some help to you figuring this issue out. Under All Pages in the site's dashboard, I pick on two of the pages I wanted to be in the children menu group of four, one already up and running for quite a while (almost a year) and one that was brand new when I did this, and basically I tried to change the "Page Attributes" on the right hand margin, which was a drop down box for a parent page, and I picked on the menu page I wanted them to drop down from. While I saw that it added that parent page into the website addresses for the two children pages, it did absolutely nothing else. Which again feels as though I was trying to make menus by using a instruction set when in reality, there was "nothing there" to make it actually happened. The whole thing was futile each and every attempt....

I don't know if all of this will be of help sorting it out, but I hope so. I have too many pages with more to add and really need to be able to use drop down menus. Thanks for your efforts to solve this situation!

It is as if BoldGrid is taking the changes (like allowing you to indent the children menus beneath the parent menu) but is not making the actual change (I'm guessing it should be creating a CSS change behind the scenes on the head page of this theme???). InMotion of course passed the buck, twice, and said it was a BoldGrid issue, not InMotion's. 

Basically, I followed the BoldGrid steps: I opened Customize, picked on menu, picked on Primary which pulled up the menus for the individual pages, used a couple existing pages and added two new pages (all published and showing), and nested the four menus beneath the menu I wanted to be the parent, putting the four "children" in order by drag-and-drop, and indenting them slightly beneath the parent page exactly as the instruction said/showed. Then I saved that menu set-up & exited. While BoldGrid took the changes as I expected, nothing changed. I then repeated the process many times, each to no avail. According to both BoldGrid & InMotion instructions, my desired changes to create the drop down menus were done correctly.

I'm using WP 4.8.8 and the Venetian theme at InMotion....