How to copy and paste indd file content into an another indd file?

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Javascript

Extended.Toolkit

I'm newbie in indesign stuffs.So I couldn't post my trials.

Objective:
I have an indd document which will have figure caption,label etc. I need to copy content(figure which is editable) from other indd file to this document where related figure label exists.

For example:
sample.indd

Some text   
Fig.1.1 caption
some text

I need to copy the content of figure1.indd and paste into the sample.indd document where Fig.1.1 string exists and so on. Now I'm doing it manually. But am supposed to automate this.

So, I need some hint how to acheive it using javascript?