SQL Server: case/if else -select and apply function only if present in table - sql

Question

I have the following dynamic query that creates a pivoted table for each account_id against the products using an UDF. I need to add spaces after the UDF is executed depending up the account_id being matched to the specific tables. This works perfectly fine, and returns the 2nd table in the image, I just want to add some condition where it checks for account id's present in other tables and then adds spaces to output from the UDF eg- the account id in the pivot matches the id present in test_rev then 2 spaces if the account_id in the pivot matches the id present in test_oncontract then 3 spaces so on
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX);
SET #cols = STUFF((SELECT distinct ',' + QUOTENAME(c.A_NAME)
FROM TEST_11 c
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT account_id, ' + #cols + ' INTO TEST_DETAIL from
(
select account_id
, dbo.make_table(apple,ball,cat,dog) AS newvalue
,a_name
from test_sample
) x
pivot
(
MAX(newvalue)
for a_name in (' + #cols + ')
) p '
execute(#query)
Image below shows how make_table udf converts the 1st table into 2nd just picking up the initials from each column name from the 1st table
I was able to call my function and add the required spaces withing the select.
But the case statement just executes the first condition and I cant get the records from the other tables. How can I implement if conditions instead of the case statements to to get data depending on all four conditions. Below is the code I am currently using:
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX);
SET #cols = STUFF((SELECT distinct ',' + QUOTENAME(c.a_name)
FROM CRS_PRODLINE c
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT account_id, ' + #cols + ' INTO TEST_DETAIL from
(select account_id,
(case
when exists (select account_id from [dbo].[TEST_R6])
then
dbo.make_sam_indicator112(apple,ball,cat,dog) + space(1) + ''rr''
when exists (select account_id from tbl_noR6)
then
dbo.make_sam_indicator112(apple,ball,cat,dog) + space(2) + ''cc''
when exists (select account_id from tbl_acct)
then
dbo.make_sam_indicator112(apple,ball,cat,dog) + space(3) + ''pp''
when exists (select account_id from test_NA)
then
dbo.make_sam_indicator112(apple,ball,cat,dog) + space(4) + ''no''
end) as newvalue,
a_name
from CRS_PRODLINE
) x
pivot
(
MAX(newvalue)
for a_name in (' + #cols + ')
) p '
execute(#query)