Drop-down menu in Grider Template

[my add]

Hello everyone!

Today I’m having this little issue with the Grider Template I downloaded for blogger.
Grider Template has an upper menu ready for customization, which I already modified on its HTML. But, I’d like to add an extra drop-down section in one of the already existing tabs.

How could I do it, with HTML and then adding the extra CSS code for styling it according to the template? Thanks in advance!

[Author]

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