Freehand SQL reports Deski to Webi Conversion

I have some Freehand SQL Deski reports in BO 3.1 environment,

Planning to convert Freehand SQL Deski reports to webi,  and then migrating to BI 4.1.

So I am planning to create a universe with derived tables, by using the same SQL code from the deski report.

My question is, is it okay to create multiple derived tables in the single universe when they are from same source.(Each derived table used for respective report).

Or any suggestions for Converting Freehand SQL Deski reports to Webi Reports

Thanks.