If you are filing your tax return as Married Filing Jointly then his SSA-1099 is entered on the Joint tax return.
If you are filing your tax return as Married Filing Separately then he would file his own tax return as Married Filing Separately and enter his SSA-1099 on his tax return.
You would need to create a new TurboTax account for him you and he are filing separately.
See this TurboTax support FAQ for starting another tax return using the online editions - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/start-another-return-turbotax...
