You should create a module with the slideshow code. Then assign the module to a position in your template, where you will include the position:
<jdoc:include type="modules" name="slideshow" />
Install the module in the slideshow
position, then in the module settings, tab "Menu Assignment", choose "Only on the pages selected";
below you can tick the menu items you want it to show on.
There are a few cases where this is not sufficient, i.e. in the blog view the articles will share the same menu item, but you might want to treat them differently. You have many options here, the best is to create a different - named position in the template, and assign the modules to the appropriate one, i.e.:
<jdoc:include type="modules" name="slideshow-all" />
<jdoc:include type="modules" name="slideshow-articles" />