Your suggestions seems to have work. From what I understand the “linked” template in now being inserted as a block itself and then saving this file as a default template will keep its link for all new models.
Just as a preference, is there a way to insert the to-be-“linked”-template without populating the blocks in the file. This is the error I receive when I try doing it ‘File does not contain any objects, unable to create block.’ Will be able to live with it if it’s not possible.
Additionally, as a test I deleted a layer from the “linked” template file. When opening a new file the layer had been removed. But on a dummy old file the layer was still there. The same happened with blocks. Is there a way around this.
Sorry to add more but something else I noticed, when changing a layer name, the new name appear but old one remained. I’m assuming the fix for this would sort all these issues out, but haven’t managed to work something out myself yet.
Thanks for your help so far.