Can you provide more details about the environment, GrandNode and steps how to reproduce the issue?
Please reach us at email@example.com
I didn't understand the question. Basically, now you are able to select both dimensions. If you select 17, it will appear in the bottom of the filters section, then you can select also dimension 18 and you will see products with the first and the second dimension. Correct me, if I'm wrong.
Hmm, probably it looks like something is messed with the Seo Friendly URL Names. Is it possible to get the access to your test store? You can send it us via email at firstname.lastname@example.org. If I look at it, it would be easier for me to find the problem.
Do you have multistore configured?
It works as expected. Products may have a many dependencies. For example orders, related products, recommended products, personalized products, etc. It's safier to delete all cache.
If I understood you well, you can use the checkout attributes feature. You can create it in admin panel -> Catalog -> Attribute -> Checkout attribute. Create a dropdown, enter the possible values (sales rep. names) and that's all.
Is it ok for you?
We always try to implement the simplest and the most usable solutions, thanks for your kind words.
We don't have this kind of feature in GrandNode.