If you want to include content related to a parent tab and leave a children tabset, for example
[Parent tab 1] __Parent tab 2__
[Child tab 1] __Child tab 2__
<Child tab 1 content>
---
<Parent tab 1 other content>
where <Parent tab 1 other content>
is shown regardless of selected [Child tab]
, try this Rmd, which is a little bit hacked by JavaScript:
---
title: "Nested tabs example"
---
```{js}
document.addEventListener("DOMContentLoaded", function() {
$(".leave-tabset").removeClass("tab-pane tabbed-pane");
}, false);
```
# Nested tabs example {.tabset}
## Parent 1 {.tabset}
### Parent 1, Child 1
Parent 1, Child 1 content
### Parent 1, Child 2
Parent 1, Child 2 content
### {- .leave-tabset}
---
#### Parent 1, Other content 1
Foo 1
#### Parent 1, Other content 2
Bar 1
<!-- next main tab -->
## Parent 2 {.tabset}
### Parent 2, Child 1
Parent 2, Child 1 content
### Parent 2, Child 2
Parent 2, Child 2 content
### {- .leave-tabset}
---
#### Parent 2, Other content 1
Foo 2
#### Parent 2, Other content 2
Bar 2
<!-- next main tab -->
## Parent 3 {.tabset}
### Parent 3, Child 1
Parent 3, Child 1 content
### Parent 3, Child 2
Parent 3, Child 2 content
### {- .leave-tabset}
---
#### Parent 3, Other tabs {.tabset}
##### Parent 3, Other tab 1
Foo 3
##### Parent 3, Other tab 2
Bar 3



As you can see in Parent 3
tab, you can even define new tabsets after you leave the parent's child ones. But you will probably be short of header levels soon :)