Update entity framework only for single table

Hello Experts,

 

I have developed one web application in mvc + entity framework.Now Project requirement is  "Add new table in to database which is depend on existing table" .

 

But when i update the entity framework model,update the whole model and i loose all validations and all other changes ...I want update only single table without loosing any data annotations,validations and other data keep as it is.

 

 

Please  help me.

 

Thank You