You can create "Web-page" dashboard that will display data and layout of some 3rd-party website where you can apply changes you need using HTML-code (create these blocks, adjust blocks layout, fill in those blocks with needed data and so on). And as a result all portal users will see a separate web-page in this dashboard (as an IFrame) and will be able to browse it and your business task will be achieved.
Add a new tab and add the newly created detail to the tab via Section wizard. There is an opportunity to add filter to the detail via JS development. Please find the example in the article by the link below:
Thanks again for the reply but it does not achieve what I want.
I want to create a new tab based on the *case Section*.
Another example to clarify my goal is to have a second tab that contains all the accounts. It has nothing to do with queues. (this is not my goal, this is an example)
If we look at the code from the link you send me we can see that "Queues" is being used:
var esq = Ext.create("Terrasoft.EntitySchemaQuery", {rootSchemaName: "Queue"});