At the left side in Menu Bar, there is option of button "Quotation". We have to click on it.
When we will click on the "Quotation", then all created quotations list will appear at the right side.
Here we can find the quotation through 'Date Range', Through customer list or we can do directly search in "Search" box as well.
Here we can see the 3 type of status. It will show 'Accepted' when the customer gave approved of the shared quotation.
It will show 'Expire' when the mentioned valid time of given quotation will complete.
it will show 'Active' when you have shared the quotation and it is in validity period.
So like that we can search the active quotation which we want to edit and then will click on particular quotation.
Here we have to click on the button "Edit" to make change something which we want to do.
After correction, we have to click on the button "Update".
Note: If the given quotation is approved by the customer/client then we will do accept it and it will directly convert into invoice. You have no need to create a new invoice for same deal.