On the Back Office : Exporting existing products and options from each stores
On each store :
Go to the store Back Office Product Page and click Export CSV
Name the CSV after the store name
On Excel : adding SKU on similar products across both stores
Create a new excel document
For each store : Save the CSV Export of the store as a store tab in the excel document
For each store : On the store tab of the store, delete info of all columns except ProductId and Name but keep headers
Create a "merge" tab with the following columns :
Column 1 : All Product and Options names of the "Name" column of all store tabs without duplicates with header "Name"
Column 2 : leave empty with header "SKU"
For each store : add one column with Product ID of the Store using vlookup with Name column of the Store from the Store Tab with header the name of the store
Update the new tab : manually merge rows with similar products that have Product / Option Name discrepancies between the stores
Manually populate SKU Column with required SKU for each product name
On Excel : Preparing CSV Import Files
For each store :
Create a new tab with the headers of the original exported CSV from any Product CSV Exports
Populate the ProductId column with the ProductId column of the store from the merge tab
Populate the SKU column with the SKU column from the merge tab
Populate : the Name column with Name column from the merge tab
All other columns empty except the headers
Export the tab in CSV with semicolon as separator
On the Back Office : updating products and options with SKU
For each store :
Go to the store Back Office Product Page and click Import CSV
Select the generated CSV of the store
Click OK
The store products and options are updated with SKU