how to use split function with inner join

hello friend please help :

i will create a function for split then i want to use this function in another query with inner join but how to solve this query any method

SELECT *, b.Price,c.Qty,b.Price_Updated_by,tbl_size.size_id, tbl_size.name, a.Category_Name,

when b.Price_Updated_by = 'Product' then b.Price*c.Qty else a.cat_price*c.Qty end as[TotalPrice],

case when b.Price_Updated_by = 'Product' then b.Price else a.cat_price end as[amountValue]

,ROW_NUMBER() over (ORDER BY B.ProductId) AS itemCount,

c.Qty[quantityValue]

FROM Tbl_Products b

cross apply dbo.split(b.sizeid,',') split

INNER JOIN tbl_size ON tbl_size.size_id = split.val

inner join Tbl_Category a on a.Category_Id= b.Category_fkid

inner join dbo.Tbl_MyCart c on b.ProductId=c.Product_Fkid

where c.SessionId='wrdme1yfvdy4zew4viliz2rj'

i want to

cross apply dbo.split(b.sizeid,',') split this query with inner join how get it