How to fill null cells with the last row that has information

[KarenHM]

Hi team 

I need to fill the cells Tasa GL, but in some rows i have nulls , so I want to complete these with the information that I have in the last row before the null.  

this is the sample example 

I used this multirow formula but only works when the null is one, not when I have more rows with null 

Many thanks 

[geraldo]

@KarenHM 

formula

//first is null
if IsNull([col1]) and IsNull([Row-1:col1]) then [col1]
elseif IsNull([col1]) and !IsNull([Row-1:col1]) then [Row-1:col1]
else [col1]
endif

[flying008]

Hi, @KarenHM 

Multi-Rows Formula in [Tasa GL] :

IIF(Isempty([Tasa GL]), [Row-1:Tasa GL], [Tasa GL])