"Failed to create, update/transform record because You have attempted an invalid sublist or line item operation. You are either trying to access a field on a non-existent line or you are trying to add or remove lines from a static sublist. Tip: Please make sure that all the line items that you're trying to use exist on the record."
I assume that this is because I am "technically" adding a component line to the work which I use to link and add the Component details.
So my question is, how do I add component details to and assembly with out adding a component line
It looks like you're working with our Support team on this, which is great since they can look into your error. I'll also follow that ticket and check with some others internally to share any additional insights here.
In the meantime, you could check out this post which has the same error.
I've attached an example import configuration's screenshots to create an assembly build from assembly item. Please go through it and try similar for your import and do let us know if you need more help.
I just noticed that it was referred to as Components : Inventory Details in the sub record mapping so I changed it from component[*].item to components[*].item. I don't think I actually tried it as component