Please help us help you and fill where relevant:
Your LimeSurvey version: 6.10.6
Own server or LimeSurvey hosting: Own Server
Survey theme/template:
==================As mentioned in your Git documentation, there are 900 predefined survey templates available. Could you please let me know where I can view the complete list of these templates? Also, is there any functionality to import a predefined template into my system, so I can use it as a base to create my own survey?

I think it's in www.limesurvey.org/template

Thank You for your response. I have downloaded code from your GIT account and i want a feature to use its existing template to import into my system so is any functionality or feature is available where i can find .lss files for all the template.

I have downloaded code from your GIT account

???
Why didn't you use the URL that Denis mentioned?

Here you see
 

and after clicking a template
 
you see all (few) questions.

Clicking the button
you see this
 

and it is inserted into you survey list
 

BUT: This is only available for users who use the cloud version, hosted at LimeSurvey GmbH.

Anyway: As said before (this few questions) why do you want to import a template.
You see the questions and withinn ten minutes you have created a survey.
You alone know the requirements of your survey; therefore such a template can only be e rough example.

Joffm

Joffm wrote:

BUT: This is only available for users who use the cloud version, hosted at LimeSurvey GmbH.
 

You can use the free version and import, and after export.

(But I have an issue here : shnoulle.limesurvey.net/555315 )

I agree with Joffm. These templates might give some inspiration, but every company, every survey need is different.

I feel like it is more effort to adapt such a template to my needs than to create it from scratch (within Limesurvey).

Those survey templates for me are just a marketing strategy of providers of survey tools, not really a helpful resource.