I presume you are covered under the Shops & Commercial Act for your area. You have informed that you employ around 700 employees. A breakdown of this figure into those who would conform to the definition of a "workman" under the Industrial Disputes Act and those who do not is also necessary.
While the relevant provisions of the Industrial Disputes Act apply primarily to "factories" under the Factories Act, the notice period requirement and the compensation and other related provisions will continue to apply even if you are a Shops & Commercial Act-covered establishment.
Now to the Crux of the Matter:
1) Chapter V-A applies to factories under the Factories Act and other establishments having employed less than 50 employees on any day during the preceding twelve months.
2) Chapter V-B applies to factories under the Factories Act and other establishments having employed more than 100 employees on any day during the preceding twelve months.
While Chapter V-A allows you to downsize (retrench, lay off, or even close down the place of manufacture) without obtaining prior permission from the Appropriate government, Chapter V-B mandates that unless you have obtained PRIOR permission from the Appropriate government, you are prohibited from retrenching, laying off, or closing down the manufacturing establishment.
Procedures are identical for all types of establishments, but permission is a necessity only for factories employing more than 100 employees.
This response is nothing more than an introduction. If you need specific advice or guidance, you will need to ask a more focused question and provide relevant information, please!
Prima facie, your issue revolves around the number of workmen you are employing and whether, therefore, you need to obtain prior permission from the Appropriate government!
Hope this helps!
Regards,
Samvedan